Dear Alan,
First I want to tell you that many students have the same problem like yours.
In fact maths is not as difficult as you think. Just think it over. You may have problems with the way you learn. You’d better get everything ready before class and try to write down the difficult points in the new lesson. You have to listen carefully when you’re in class. It can help you understand the lesson better. Don’t forget to take notes if necessary. You also need to review the lessons after class. And try to do a bit more exercises if you wish. Don’t worry too much about it. Keep trying and you will soon learn it better. Good luck.(