I went through a very similar experience last year, this year I still feel its impacts, its insidious. A little voice telling you that you can't. You're too tired, its too hard and that there's no point.
I don't know if this is the best way, and it sounds very weird. But every time i thought to myself that I couldn't, I told myself there was no option, I needed to. If not, everything I wanted would just disappear.
To be perfectly honest, the inner confliction nearly killed me. I did have to see a counselor, if you can don't go to a school one. See your doctor about it.
I can't say its the best way, but its how I got through it.