I personally wouldn't have anything surgically done to myself but I'd probably change my nose because it's shaped like an eagle beak and people can't stop bringing that up. I don't really care about it though so IDK xD I'd also change my hair because it's so frizzy, straighter hair would be much easier to manage.
In addition to this, I would love it if my voice didn't get so high pitched most of the time.
I was gonna say eye color because I would really like it if they were brown (they're hazel so they're almost there but it's just not the same ;/) but then I remembered my one stupid foot is bigger than the other so I would change that for sure. It would make buying shoes less annoying.
But I suppose since this isn't grounded in what is possible in reality, I have a brain deformation which basically means I'm in pain all the time to some degree. I'd probably get rid of that instead of my big honking nose if I could
My low self-confidence
There are a lot of things i want to physically change about myself but if i had to pick one, then maybe the size of my forehead lol