When a friendship breaks?

Okay, i understand that it may be hard to be different because i was 'emo myself and i got teased just like you did. However, i didn't let it phase me. I used to ignore people when they said that and although i did suffer from depression and i did self harm, i always had a smile on my face for the sake of other people. Explain to your best friend how you feel and just tell her that your sorry if you have upset her but you don't want to fall out over something so silly. Remind of her of old times and invite her over for a sleepover. Maybe then you two could have a catch up and re connect. Also, you should try be a little more out going and confident, it's hard i know but it will pay off eventually and you will make new friends :)