How can i easily or not get rid of my man ?

hi i am a 15yr old male, i weigh around 80-90 kgs and yeah i am a bit big, and wondering how can i get rid of these man s that piss me off witch also i don't really talk to girls since i feel embarred. i can't go to the gym and do weights or something since i am too young. but any other ways besides the gym. thanks!