Why are my cl mates immature?

XD I'm 12 too and I found that joke funny but I think ur just more matureSince your bros proably transformed you into a pre-adult and ur still around other people at are 12,13 etc so its normal. My friends say crap that I find immature but I dont be mean just because it was lame I just pretend to find it funny, not laugh at all or just ignore it. remember ur still a kid don't grow up to fast...