You are 16. So far the amount of time you've existed without breasts far outweighs the time you've existed with them. Of course they're going to feel foreign to you. You JUST got them. You don't need to have been assaulted in order to hate your breasts. Puberty is rough on EVERYONE. I'm not saying this to minimize your feelings, but I've seen so many trans teens say the same things everyone says about puberty, but frame it as dysphoria. Give it time and be kind to yourself.

A few things to keep in mind, coming from a former TiF:

Being more comfortable with a "unisex" name and male pronouns doesn't mean you're a guy. It means you hate being a girl. Which is very normal considering the world we live in.

Hating your breasts doesn't mean you're a guy. It means you either hate having breasts, you hate being a girl, or both. Which, again, is normal. A lot of women hate their breasts. Hatred of ones breasts doesn't mean they're men.

Having panic attacks when shaving your vulva doesn't mean you're supposed to have a dick instead. It means you hate having a vulva, you hate shaving it, or both. Once again, this in no way makes you male. If you don't want to shave it, don't. It's better if you don't shave it anyway so you don't irritate the skin down there.

|I personally haven't experienced any sort of sexism or sexual harassment, nothing of the sort

While it's great that you haven't been harassed or assaulted, there is no way you haven't experienced sexism. Especially as a young lesbian. So many FtMs say this but sexism and gender roles are everywhere. There is no way that you've managed to transcend something that permeates every corner of society. It doesn't have to be overt. I had to correct a friend the other day for assuming my doctor was male. This adds up. It bleeds into hobbies (crafts are coded as a "girl" thing). It bleeds into competency (being good at math is seen as masculine). It becomes obvious that you have to specify when a doctor, scientist, engineer, or programmer is female because many people will assume a male default.

I'm not saying these things happened to you specifically, I'm giving examples of sexism that can be hard to recognize but easy to internalize.

Also, most people don't have a gender identity. Don't let people lie to you and say 'cis people never question their gender/cis people don't hate their sexed body parts' because that isn't true at all.

'cis people feel like their gender' is probably the biggest lie of them all. No one 'feels' like their biological sex. I don't 'feel' like a woman any more than I 'feel' short. I can be reminded of my height when I'm next to someone very tall. I can be frustrated or uncomfortable when I can't reach something (similar to how being called "she" reminds you of being female and causes you discomfort). I can even hate my height so much that I always wear lifts in my shoes, post in forums for tall women, and desire surgery to make my legs longer. But I don't have some innate sense of shortness. It's not something I feel, it's something I AM. The same is true for being female. Not feeling like a woman doesn't mean you're a man. It means you're a female human who hates being female. I'd advise finding a therapist who isn't gender affirming to help you sort out why.