How can I act more mature?

this boy at my school says im immature how do I show him im not immature? please give me advice

Well if your just being yourself and he's calling you immature who really cares!? That must make me immature too! BUt if your just acting immature because your shy around him just let him know that! So really just be yourself and if he doesn't like it, tell him to get over it! Lifes about having fun and learning!!

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well you can tell him that he is immature cause his mind didnt devlope yet because guys take longer to become mature I think there age is llike 18 and girls age is like 14

Who cares what he thinks? Honestly.
If you're being yourself and he doesn't like it, the hell with him.

um dont be as annoying and just play it kool. your gunna lose him if your being annoying just suck his d*ck or sumthin ya know

dont listine to starkinkade2 shes immature. oh and she didnt say she was dating him dont you read.

thanks for replying to my q. you're the only one who did.
for this question, simply show that you don't care about
what he thinks about you. even if you do. show him that
you're comfortable with who you are and that his opinion
doesn't matter. just be happy and be around those that
make you feel good. if he's taking the time to say you are
immature, really it flips around on him, and he comes off
as the immature person. I wish you luck with that! ; bye.

omg I love starkinkade2 he's so funny!!