This feels woefully inconsistent. One minute it's "I just don't like looking at them, maybe I don't like tits", the next it's, "I know exactly why I don't like them, and it's none of your business," then it's "I want to explore my identity," and finally, "well actually they cause me pain." It's obviously not impossible for the former and the latter reasons to all be true, but given the flow of how this has been expressed I would guess that the pain aspect is either untrue or exaggerated as a justification. If you're actually healthy and aren't fat, but also have such large breasts that they're causing abnormal pain, then there are a few avenues to deal with this physically: Cardio, fixing your posture, and finding the right band/bra to mitigate the issue. From what I've observed over the years, women with back pain they think is from their breasts may have other underlying issues worth being check out for. And remember that, even if you were to hack your breasts off, you would still be a woman, just a grossly disfigured one with hideous scaring.