Re: I hate school, which makes anxiety worse.
You say that most of the people in the classes don't like you... try not to think so negatively. When I was in high school, I assumed a lot of people looked down on me; I was in marching band, etc, so I didn't feel very "cool". In reality, I found out later, a lot of people who could have been my friends were scared off by my "loner" personality. I thought that most people were too cool for me, and those same people thought that I was too cool for them.
It's a vicious cycle, but I bet it would help you feel better if you tried to break out. Think about why the people who don't like you feel that way. If you can't think of a reason, maybe they could like you after all.