For me the things you should do to improve yourself is this:
1st: you should ask God to help you always and give you wisdom and knowledge
2nd: So that you will not hate and fail in your subjects, be confident, and study very very hard until you will love your subjects and you will love going to school.
3rd: In able to have friends, show your classmates who you really are and what you've got... in fact when I was on my 1st year in high-school I've got also no friend but when I show them what I've got and they start on coming to me that's the reason why I have now many friends... I know one day your classmates and schoolmates will just realize how good you are.
4th: The last but not the least DO NOT LOST HOPE...AND ALWAYS SMILE WHATEVER HAPPENS
I hope I have help you!!!