It sounds as though you're really struggling at the moment. However, it feels as though you have noticed things are getting rough, and you want to turn them around into more positive feelings. You mentioned that only one person in your life knows you self harm. Is there anyone else you'd feeling comfortable talking with (another friend, GP, college) to spread the range of support you can recieve?
Something that i find really helpful when trying to distract myself is listening to the emotions im feeling, and then tailoring my distraction technique to that. Say it was anger, i'd do something to release that anger like ripping up paper or punching a pillow. Perhaps you could look at the
BIG Distraction Page to see if anything seems helpful.
Please be sure you seek appropriate medical attention for any wounds if that is required.
Take care.