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)
I love my body but sometimes there is this thing on the back of my head my boobs are not big enough (And I like to take pictures of myself but the insecurity is always there) F 19 150lbs 5’6