"You know what concerns me and is probably going to drive me nuts? It's my voice," the former Olympian says in a bonus clip from her docu-series, I Am Cait. "I really haven't disguised my voice that much."
While she may have had surgery to feminize her facial features, the 65-year-old still has a deeper masculine tone. She even shared with her stepdaughter Kim Kardashian West, 34, that she would try using a feminine voice at hotels when calling for room service.
While Jenner laughed it off when Kardashian West said her attempt to sound more like a woman sounded "no different," she later admitted that women can't relate to the issue she has with her voice and it's important to feel good about that part of who she is.
"It sure helps with your appearance. It really changes people's perspective with the way you talk," she said.
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While her voice may be a concern, it's not Jenner's biggest challenge. In another bonus clip, she and trans model Geena Rocero have a conversation about Jenner's story. She reveals that while she's felt transgender her whole life, she's a newcomer to the trans community and still doesn't quite understand it.
"I have been isolated my entire life from this issue," Jenner says. "It's very hard for people to understand. I've lived it my whole life and I don't understand it."
As she works to gain an understating of the trans community and her place in it, one thing she does feel comfortable about is her newly enhanced cleavage.
Jenner is unperturbed when a producer tells her that "her girls" are showing a little too much. "Paid big bucks for 'em," she responds.
I Am Cait airs Sundays at 8 p.m. ET on E!