THIS sister!
Look I know how you feel because I've been there. I was here before for years and then I came back under a new name. Anyways, I used to get very offended with pretty much everything. One of the first people to do damage, ended up being one of my best friends on here. I never thought that maybe he was just sarcastic and silly. I have grown by being on here. I've grown thick skin and I don't care what anyone says about me anymore.
I encourage you to stay. People will be mean forever. This is a good stepping stone into the real world. It will be uncomfortable and it will hurt sometimes, but trust me, it's worth it. In real life if someone hurts me or says something that I don't like, I don't care anymore. Before I probably would've cried about it like a baby. See what I mean? Negativity sometimes toughens you up.
Now I'm not saying to take it and turn the other cheek...but I mean that if someone says something that bothers you, tell them off or brush it off your back. Do not hold on to it.