It took me until my 50s to stop being self-conscious about my slender body and skinny arms. Exercising more helped a bit but it was mostly in my head. My advice - love yourself now! (The sign was for a Twitter pro-nudity campaign)
(f) 31. 5'2". Used to shave my bush for an old partner who refused to go down on me until I did. Happy to say that I stopped and I've found better (and hotter) partners since then .