how can I get along with people are to immature?

First of all, don't worry. It's perfectly normal for good Friends to have different personalities. :)

If this childishness is causing tension between te and your friends, I'd suggest te focus on what te do have in common with them. What hobbies do te have? What TV shows and Musica do te like? Find a common interest and take it from there.

Being mature does not make te "lame"! It's important to just be yourself. If te spend your teen years pretending to be someone you're not, te will regret it when you're older, so be true to yourself. If your Friends try to pressure te into changing your personality again, try asking them, "why can't I just be me?" It might not seem like a very complex question, but it might help them realise that trying to change who te are is wrong.

Think back to how te became Friends with them. te mentioned that te pretty much get along, and that's good! So, why do te get along with them? How did te become Friends in the first place? There's obviously some reason te two can get along well, so focus on that too.

So, long story short: find common interests, remember why te are Friends in the first place, and be yourself!

Good luck! :)