How do you pick yourself up when you disappoint yourself

[kappaloo]

Today, I got back two assignments. I got 57% on one and 70% on the other. They are both about 15% lower than expected and 20% lower than desired for the course.

I find myself beating myself up over them. I just keep thinking had I started early... read more... did more work; I could have met my goals. Even worse I keep telling myself that I can't do better - that I'm just not smart enough and I'll keep disappointing myself. Why try?

I know it's irrational, but these are my thoughts - how do you pick yourself up when you're down? I need some help...