I'm 16 and my dick is 6" exactly right now. When I was 13 it was around 4.5" to 5". So I suppose that 6" when you're 13 is pretty big. But don't worry either way, penis size is more of a competition between guys than something that girls actually care about. Anything above 4.5" is fine.
That's big for your age- there were only a couple of boys with large cocks when I was that age. The erect ones I saw then were not as big.
oh those were the days i was like 7 and a half inches and now im ... very good. so i think you are good man. some girls dont like big dicks, its a burden having one for that reason.
Too much more length is NOT a good thing! (for either you or the girl) Examples: Let's just say I may never know how great "balls deep" might be. Kinda sucks. Gotta watch out not to bottom out too. Girls don't usually like that kind of pain...