How can I act like a more composed, sophisticated girl?

Okay, well I'm a fifteen year old girl, sophomore in high school. I've been noticing over the course of about two years, that I am quite different from other girls my age. I get annoyed super easily, so I don't talk to many girls, and I'm mostly friends with boys. I've tried making friends but I'm just so different :/ I feel immature around other girls. I'm more silly with an extremely weird sense of humor that I most likely picked up from my best guy friends. How can I appear more friendly to girls? Is tree any sort of conversation I should talk about?
 
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