'Shadowhunters' Katherine McNamara Shares Her Best Advice For Young Hollywood

— -- Some people have a calling. Katherine McNamara has a few. By age 14, already graduated from high school and starring on a Broadway show alongside Catherine Zeta-Jones and Angela Lansbury, it was clear that McNamara was on a fast-track.

Now, the 21-year-old actor best known as "Clary Fray" on Freeform’s “Shadowhunters” is branching out, and plans on expanding her career in every direction that interests her.

From her upcoming debut album to finishing a master’s degree at Johns Hopkins University, the multi-faceted young star will stop at nothing -– even sharing with ABC News’ Chief Business, Technology and Economics correspondent Rebecca Jarvis that she considers being the CFO of a company, or running her own company, a likely possibility for her future.

In a recent interview on "Real Biz with Rebecca Jarvis," McNamara talked about everything from how she got her start to the worst piece of advice she's ever been given, and how she thinks social media affects her generation.

Here are three pieces of wisdom from Katherine McNamara:

1. On being young in the entertainment industry:

“My attorney always makes sure to have time to go over my contracts with me because I have at least 20 questions every time I get a contract, but it helps because then I know exactly what I’m signing,” McNamara said. “I want to know exactly what I’m getting myself into, which so many people I know in this industry have no idea what any of that means.”

It helps that McNamara graduated with honors with a Business degree from Drexel University at age 17. She’s now pursuing a Master of Science in Applied Economics, which sounds like it will come in handy for any contracts and negotiations down the road.

2. How being similar to her character "Clary" is both a “blessing and a curse.”

“It helps because I can relate to her on so many levels, but when it gets to the emotional side of things, a lot of things hit very close to home,” she said.

“Something that’s very interesting is the mother-daughter relationship on the show this season,” shared McNamara. “I don’t necessarily have that with my mother but every young person goes through that in some capacity.”

3. Speaking of family –- what do they think of McNamara’s booming career?

“My whole family is in science and medicine, so this whole world is completely different to them,” she said. “They were supportive, they said, ‘Go follow your dreams, do what you love, just make sure you go to school and get an education.’”

Since landing her first big role on Broadway at 13, McNamara hasn’t had a shortage of work since -– spanning the stage, television and film, and now the music industry.

“Now they’re recognizing the longevity that this can have, and the build that this career can be. It is a marathon, not a sprint, that it will be something that’s going to last, at least for the meantime.”

You can see Katherine McNamara as "Clary Fray" on the upcoming season 2 of “Shadowhunters”, premiering January 2, 2017.

For more insights from Katherine McNamara, watch her full episode of "Real Biz with Rebecca Jarvis," and follow @RebeccaJarvis for more live interviews like this one.