Why are you worried that you can't do it?

I think if you put your mind to it and tell yourself that you CAN do it, then you are more likely to succeed.

Also, I recommend for you to talk to your therapist about forming a "game plan" around how you're going to do this. I think everyone with mental illness should develop strategies for coping with academic stress, because I know firsthand how much strategies would've helped me. I speak as someone who has a bachelors in engineering and masters in computer science.

If you need any advice though... feel free to shoot me a PM and I'll be glad to help.