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)
M [27, 5’9”, 192lbs] doing a lot of trail running and slowly chipping away at a lot of the extra weight I’m carrying around. I’ve got a ways to go but I’m feeling better after every run