I don't self-define as a feminist partly for these sorts of reasons: I think it's very difficult to tease out the "whys" of a process - are we doing this for ourselves, truly, or is it (also/solely) for an external audience etc etc How can we be sure our processes are self-driven and not shaped by societal expectations?
So - for example: I know that the way I present myself is down to my own choice, because it's not conditioned by society's expectations - I don't wear make up and am not interested in clothes deemed fashionable/stylish etc So I feel OK on that score: but shaving my legs? I've done it for 30 odd years, and I'm fairly sure I did it in the beginning because the societal expectation was that women in the UK shaved their legs (to be fair, I was about 11- I can't actually remember anything except nicking a huge chunk out of my ankle
) Why do I shave them now, when no-one but me sees them? Because it's more comfortable - I find it itchy (even when the hair is longer and not just stubble) and too hot (I often have to go to uncomfortable climates for work) So it started, probably, as a societal expectation - but remains a process because it's comfortable for me. Same with my underarms.
When it comes to my mons pubis, however, I went fur free decades before it became the fashion - it was driven by comfort at the time (working outside overseas in extreme heat: makes it less sweaty and itchy, plus easier to keep clean when you have your period and there's no running water, never mind an actual toilet) and remains that way because I find it more comfortable and less itchy still. So like my unfashionable clothes and make-up free face, I am sure that's driven by my choices, not by what society expects.
But I think in general, it's quite hard to tease out our own motives for things, which I think is OP's dilemma. I'm not a fan of cosmetic surgery, but not for feminist reasons - I just think you'd be mad to put your body through surgical procedures that weren't medically necessary. At the same time, though, I can see how some - including boob jobs - could be psychologically necessary: but I think I'd personally want to be sure I'd perhaps had counselling to unpack precisely why I felt it was so important for me. It's pretty straight forward to define why, if you've been attacked with acid, you might want your face treated. It's less clear cut, though, if you're talking about natural signs of ageing etc
I guess what this post is really about is that I am not sure it's as clear cut as PP are implying, maybe.