How to break an addiction to the computer when I use the computer for schoolwork?

When I get home from school start your computer and start doing my homework (research, testing, etc) and generally do not lower the unit to 10 or 11 at night, except for dinner, walking the dog and loves it. I do homework all the time, but my problem is when I need a break I stay on the computer and go to YouTube, Yahoo, etc. makes me mad because I'm very athletic and I want out and run, but I just … no. It seems that as a problem of time management than anything else. How I can stop going to sites and unnecessary to begin to focus exclusively in the task when I'm on the computer?

First, this question of yours is not any medium, is a mental health problem. But go further, you should do a calendar. Write (on a sheet of paper on your computer) how long it takes to do your homework. Now, assign a time for that. For example, does the task to say 5-8. Then, jog or anything like to do (not including the electronics). But you have to shut down the computer first, and not just hibernating / Suspension, which can help not relapse. Also take breaks from their duties. Eating, cooking, or simply walking and running. One more thing, try to make a list things that have absolutely no need for a computer. If you do a test, for example, writing a draft in hand, and then do further research on the computer to improve then enter and go. math homework, for example, does not require a computer. Good luck