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", 57 kgs. I was telling my friend the other day that the thing about being a formerly plain/invisible girl is that even when the world finally starts looking at you, you never forget what it felt like to be invisible.