It shouldn't matter at that age. Nobody other than yourself should be seeing your penis anyways. The average adult penis is 6 inches when hard. It can be bigger or smaller. But when you get older you will realize that it is not the size that matters but what you do with it. If people make fun of you than they aren't worth your time.
well sweet heart listen ur only 12 u should not be worried about that everybodys body is different