Sarah, now 50, came out as transgender but was still "being clocked" as male.
"You are walking through the mall and someone turns and says, 'Oh, my god, it's a man dressed as a woman,'" she said. "They figure it out."
But that rarely happens anymore. Thanks to facial feminization surgery in 2007, Sarah, not her real name, is living with the face she was believes she was supposed to be born with.
It was the first big step in her new life as a woman and in 2009, Sarah went on to have sex reassignment surgery.
Now, the former electrical contractor said, "I get treated like any other woman there," she said.
What makes a person's face look feminine or masculine?
Humans worldwide have a "gut" reaction to whether a person is a man or a woman, and it is not based on the "obvious," according to Dr. Jeffrey Spiegel, chief of the Division of Facial Plastic and Reconstructive Surgery at Boston University Medical Center.
A woman's eyes and mouth reflect more light than man's, according to Spiegel, who did Sarah's surgery. Women's eyebrows are arched and reach a peak at the edge, and men's are slightly lower and straight across.
Women's lips are positioned higher on the face and more teeth are visible. Their chins also tend to be smaller and more tapered.
"It's hard to look female," said Spiegel, who calls himself "the best" in facial feminization surgery.
When research subjects are shown photos, even for just a fraction of a second, they almost always get the gender right. "When they make a mistake, it's always thinking that a woman is a man and never that a man is a woman," he said.
Spiegel views his work as "gender-confirming surgery," and the goal is to provide all the subtle facial features that support a person's sense of who they truly are.
"I didn't know what gay or transgender was growing up," said Sarah, who attempted suicide and was misdiagnosed as bipolar during her unhappy marriage.
"It was a major taboo in my generation," she said. "But I knew something was wrong."
Growing awareness among transgender people that medical help is available, as well as more information online has fueled Spiegel's business.
Since 2004, he has performed more than 500 feminization surgeries for patients from all over the United States and the world. Surgically speaking, it's more difficult to make a man's face appear feminine than the other way around, according to Spiegel.
His work incorporates several different procedures, such as jaw-narrowing techniques from Asia. He also considers other features, such as lip and scalp height and shadowing on the eyes.
All that scientists have attributed to feminine beauty is "outdated and the tenets are not accurate," said Spiegel. "Plastic surgery has completely changed what we think about beauty."
Does a beard or a bald head always make a person look masculine?
"If you see a woman who has a shaved head like Sinead O'Connor or a woman undergoing chemotherapy, you don't look and say, 'There's a man,' but 'There's a bald woman,'" he said.
"Similarly, if you see a bearded woman at the circus or a hirsute woman whose genes give her hair on the face, you think, 'That woman needs to do something about that.' But no one thinks it's a man dressed as a woman."