Well procrastination is something you must deal with immediately. I'm a bit of a putter-offer myself, but it feels really good to get something out of the way.
If it's any consolation, your post does ring a few bells to me. So you're not the only one, dear.
Unfortunately, I don't have any good motives for studying. I do most of my work out of a fear of being useless; seems as if I get over procrastination by thinking about what might happen if I don't complete my homework. Perhaps there's a bit of inferiority complex in there too.
I stopped working so hard once someone forced me to accept that I was competent at the subjects that I do. Kinda wish that he didn't, actually...
In any case, when I don't have anything to do, sometimes I do a bit of studying to make sure I don't let my mind wander, because that doesn't usually bode well.
If I do want to have a good study session, I always get a bottle of water (so I don't have an excuse to get up) and all equipment necessary beforehand. Next, classical music has always helped. It doesn't help you concentrate that much - I just like classical music.
Actually, if you listen to something complex like Mozart, it can distract your thoughts - I find this helpful when I want to stop thinking about anything, whatsoever.
Anyway. I'll conclude my worthless contribution. Best of luck with everything, though!