Did I Do Something Wrong, or Did I Choose Bad Friends?

Honestly, your best friends are not your true best friends after all. And wow about what they said, that was really hurtful and I couldn't handle that. Actually you don't need to change if you didn't do something wrong and I'm sure you didn't. They're the ones who need to change because of their bad attitude. And they did that because they didn't like you anymore. Get new friends and be careful, you need to know them first before you became best friends with them because they maybe just "Plastics". And try being more defensive in a good way if you can.