I'm fine with my body. Realistically, I would like to be healthy as possible and be more athletic (both things I'm working on and are attainable).
Then there are the fantasy things I would change, but don't worry about since their ain't much I can do. Mainly what I would like changed (if it was possible) are eliminating injuries that have occured. I'll name them off in roughly chronological order.
Such as being circumcised upon birth. Haven't had any problems (being circumcised), but would like to feel how things are naturally (and "foreskin restoration" ain't the same thing).
Eliminate acne scars. Not really noticeable (unless you're looking for them), but would rather due without them. Most of the scars I have I got after taking Accutane for my acne. Broke out horribly (much worse than I ever had before) when I first took the medication which caused the scars. Probably would have been better of eating a better diet (less of the refined crap that everyone eats, bad food culture in USA) and getting more sleep instead of being put on prescription medication (with side effects). Doctors typically treat symptoms with drugs instead of addressing the cause of things (imo).
Eliminate stretch marks I've gotten from from various activities. Such as a stretch mark on my upper peck from hauling a 40lb backpack during 4 years of highschool (because we didn't have enough time between classes to visit our locker). A stretch mark on my lower back from wearing a stupid unnecessary support belt they made me wear at a previous job (lots of lifting).
Other miscellenous scars and injuries (from sports, accidents, etc...) I could on and on about.
Stop aging. Aging is basically accumalated damages to your entire body. I mean it sucks to get older. I look younger than most people my age (people think I'm 18 at most, when I'm really 24), but that's just because most people live an uhealthy lifestyle (therefore aging themselves faster), I'm thin (within ideal weight for my build), and my skin is still oily as hell (which has the side benefit of preventing wrinkles). I can personally tell that I've been aging (vs. when I was 18). Nothing major (yet), but would rather be young forever (who wouldn't?).