Look at it this way.
People teasing you isn't God's problem. That's the person's problem. They are teasing you because something is going on in their life, and they don't know how else to cope. Trust me. I hate to admit this, but I used to make jokes at other people's expense. And it was all because I was going through major s--t myself.
That said, people have free will. People can choose to do bad things, or not. People can choose to be kind, or not. It sounds like the people around you are making the wrong choices. And I am very sorry.