Why Do I Always Do This To Myself?

I don't do my school work and I don't care. Then I get to school, my teachers ask me why it's late, I give them some transparent excuse, and I feel like shit. But then I still don't do my work. One day every two months or so, I get so fucking stressed that I just break down. All of the guilt, and pressure, and work from the previous weeks comes crashing down on me. Most of the time I can just laugh it off, but every once in a while it hits me really hard. What the fuck is wrong with me? I'm going to fail out of college next year. I've been on the verge of tears for the past three hours. I just want to hold my girl.