krs2snow, you have to leave your comfort zone and try really hard to attend all the classes. Like de said it will be better for you in the long run, try not to worry about the classes that much, worrying won't achieve anything besides stress and additional anxiety.
You don't need drugs, just focus. You have a goal, focus on that goal and achieve it! I know you can! You're obviously very ambitious and I'm sure you'll do great if you really try.