Why do I feel like I need a change and do I really need a change?

I am an incoming Sophomore and I feel isolated around people who are around my age. I don't dress like super feminine, I wear skinny jeans with vans and a really basic top but I feel like I should change the way I dress to fit in more and be like one of the normal teenage girls out there. I don't have like a whole bunch of friends to hang out with during my free time but I have one close friend who I occasionally hang out with during summer. I also had been told so many times that I sound like a little girl and I am like so soft and shy and all. It really lower my self-esteem. & My hair! Everyone seems like they spend 4 hours a day on their hair and my hair looks just like wavy and unpleasant. I've been told so many times also that I am being too nice to other people and my friends told me that people just take advantage of me. I just can't help it to be nice sometimes like, "Fine whatever, I'll pay." or "Fine i'll do it for you." I feel down almost everynight because all my friends have a best friend or more than one and I'll just stuck in my bed writing on my diary. WHY!!?