I don't know what to do in uncircumcised and its at the bottom left of my penis head and I'm almost 13
Hi Harry,
It can be normal.
The inside of your foreskin separates from the glans as you get older. It just may still be a bit early.
Normal erections and masturation will help it separate. Don't force it! It could leave a scar if you do.
Give it some more time.
Thanks a lot I was just over worrying :)