How can I be a nicer, more positive person?

I use to be a very happy, lovely girl but ever since my teen years, I have eventually become less optimistic about life, don't try as hard at school (I use to always get 100% now I only get in the 70-90% mark on subjects) and less nice, saying the truth more which is often mean.

My crush (who likes me) has even said that I'm the mean one.

How can I be more positive and nicer? I feel like a bitch (I'm not that extreme but still...)
How can I be a nicer, more positive person?
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