Former Dallas Police Chief David Brown recalls deadly 2016 shooting

In his new memoir, "Called to Rise," ABC News contributor David Brown writes about his eventual rise to becoming Dallas' Chief of Police.
8:43 | 06/14/17

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Transcript for Former Dallas Police Chief David Brown recalls deadly 2016 shooting
Now to an intimate look at a pioneering YouTube star, Bethany Mota. Internet famous at age 13, she's now all grown up and both a style guru and an inspiration for millions of teenage girls. Tonight she's opens up about her painful past to ABC's Abbie Boudreau in our series "Social stars." So you have all your equipment ready to go you sit on the famous couch -- I sit on the couch. Reporter: Inside the studio of YouTube star Bethany Mota learning the one on ones of creating a fashion hall video. How do you pick which clothes? New clothes from Brandi Melville -- Normally with videos it's items I've gotten recently. I'll do a summer hall in summer, a fall hall, whatever. Just kind of talk about the things that I got. To actually see it on someone and not on a mannequin, it's helpful. Reporter: Helpful indeed. Bethany is a virtual bff to millions of teenage girls. Her YouTube videos today have a combined total of nearly 1 billion views. With more than 10 million subscribers to her channel. She calls them her mota-fam, her mota-vators. I genuinely feel they are my friends. Reporter: Her young fan base turning to her for just about everything. From her favorite mascara -- Apply that to top and bottom lashes -- Reporter: To how she organizes her pencils. I can't tell you how many of these I made. Reporter: Bethany's addictive makeup and fashion videos have made her an icon in the online beauty world. That's what I love to do in general, just creating something that I feel so passionate about, that can hopefully help and inspire other people. Reporter: Her inspiration transcending beyond foundation sponges and lip gloss. Hoping to motivate her young fans to embrace themselves and find their voice. One thing I really talk about as much as I can and try to implement is just self-love. And self-acceptance. Reporter: Should go this now-confident 21-year-old once struggled with. I was very shy growing up. I was so scared to talk to new people, meet new people. I just almost insecure of my own thoughts and opinions. Reporter: When Bethany was only 12 years old, she says she was bullied online. How are you cyber bullied? Basically they posted all these photos of me, photos I felt good about. Captions like, look at me, I'm so ugly, I'm so fat. It was upsetting and it caused me to really just -- become very insecure. At a very young age. Reporter: Bethany says the bullying had a profound impact on her life. As she details in her new book "Make your mind up." In the book you talk about having anxiety attacks. Yeah. I just was very insecure. And anxious about so much in my life at that point. Fear was controlling a lot of it. Reporter: So much fear she left public school and the bullies behind to be home schooled by her mom. I remember reaching a point where I was like, oh, I'm okay. I guess I'm going to feel like this for the rest of my life. Reporter: Bethany built up the courage to film her very first YouTube video. She was only 13. I had my mom take me to the store, I got some makeup, I just filmed these products that I was very unfamiliar with. And that's kind of how it started. It was a slow start. And then eventually it caught on. Reporter: Bethany's relate ability catapulted her to YouTube superstardom. I suddenly started embracing my thoughts and opinions. Things that make me happy and that I'm passionate about, which I never did before. And it would have never happened if I wasn't cyber bullied. Reporter: Her influence even catching the attention of the white house. How are you? Good, how are you? Good to see you. Reporter: In 2015 she interviewed president Obama on YouTube, asking him questions from her fans. My question for you, how can we prevent bullying in schools and online? It's something that happens on a daily basis. I've got to say this is one area where I think your voice is more powerful than the president of the United States. And when they see young people like you who are willing to speak out and say, that's not right, and protect other people from this kind of bullying, cyber bullying or any kind of bullying, that's what changes people's minds. I was freaking out. I had to hold my hand. Because my hands were shaking. And we got a selfie afterwards. Whose idea was that? Was it his? It was mine. Of course, okay. I mean, everyone was up for it. So you have this enormous audience. Do you feel an enormous amount of responsibility? I've never felt like I have to take care of them. I just found for me the best way to do that is just being myself. And being honest with them. In any way that I can. Reporter: And while Bethany might make it look easy, she says her success hasn't come without sacrifice. And creative challenges. She tries uploading one video a week. What's difficult about it? There can be a lot of doubtful moments. That's happened to me a lot with videos where I'm like, I don't know if this is good enough what if they don't like this? There's a lot of pressure and you're definitely your worst critical Nick this situation. Did if you see something negative do you not even read and it move on? Now I don't respond to negative comments because I feel like that's time I'm wasting that I could be responding to this person who took time to reach out in a positive way. Reporter: She says she'll be doing things her way and forging new ways for a very long time. I don't see myself quitting any time soon. Any time I feel self-doubt or I feel a little off about what I'm creating I think about those people and those people that enjoy what I put out and are excited and are asking me when the next video is. That's motivating. So I think for me as long as they want to continue watching, I want to continue making things for them. Reporter: For "Nightline," I'm Abbie Boudreau in Hollywood. Next here, we're gearing up

This transcript has been automatically generated and may not be 100% accurate.

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