I'm going to skip classes due to anxiety
Yes. it's hard to focus when my mind is going in every direction.
Yes, I can't handle it anymore
Anxiety is really hard. You should get treatment for your anxiety. With treatment you'll be able to cope better when feeling anxious and you'll make it to class.
It doesn't matter what I do. I'm going to drop out.
Instead of doing that. Try to get help first. You'll never know what will happen when you get treatment.