Of course there is nothing wrong with being a thirteen year old gamer. It's just many of our peers are.... well, retarded. They're loud mouthed, spew out profanities, racist, sexist, and to top it of: they think they're better than everyone else. It's these morons who ruin the game for everyone, so many older players merely shun young gamers and throw us all into one group.
Is it fair? No. Can I understand? Yes.
Right now, I'm practically 15, so my voice isn't as squeaky as it once was and I've matured a little bit, so I get a little more slack from the community. Just ignore the trolls and just keep playing your game. If there's a mute function, use it. If there is an admin around, ask em' for assistance. Just enjoy the game.