Hi Alex, that's awful your friends treat you like that. Some friends like banter but it's not banter if you're being hurt by it. I think 9006 is right that they might be looking for a reaction.
I hope you can find better friends, but I'm sure most people here know it won't be easy. I've only just joined myself, so I don't really know what the place is like, but maybe we can learn from each other, support each other, and (I hope) develop the skills to be able to make friends offline as well.