Why are High School girls so immature?

So, being single, i need to find some thing to blame it on. This week i have chosen immaturity in highschool girls. But i find it a real problem, every time i talk to girl i find them childish. The worst thing about it is that they dont get my jokes! Now trust me, im not some loser (no offence losers). So i doubt thats the problem.
Why are High School girls so immature?
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