Anxious about going back to school, how to not psych myself out

I start Real Estate classes on Tuesday, and up until today I was confident but now I'm worried I'll get too anxious and skip. I have a past history of skipping and even though I only have to complete 90 hours, 3 days a week for 4 hours, I'm worried I'll feel too judged and get anxious and second guess everything. How can I stay motivated and draw comfort from every situation?