Some boys foreskin takes longer than others to be able to be pulled back. Its It's natural in most cases. As long as you are able to piss and shoot cum normally you're normal. If you are having trouble with doing so you may have phimosis which means the edge of the foreskin is too tight. If this is the case your parents should take you to see a doctor. You might need to have the opening of your foreskin loosened up a bit. But don't get fully circumcised. Otherwise it sounds like your penis gives you a lot of pleasure.
im 13 and i share a room with my 15 old brother. i hear him jerking all the time. sometimes we both get naked and jerk together. never touch. i cum on my chest he usually cums in a sock.
im 17 and when my 13 year old bro broke his arm playing soccer i would help him dress and bathe. we usually jerk together because we share a room. but since he couldnt i would stand behind him in the shower and jerk him off once week. i eventually gave him my blowup doll and he screwed that everynight.
...........Play a game like "Truth or Dare"