I have a mental block with homework/school!! HELP!?

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I have a mental block with homework, HELP!?
Ive always had a problem with homework...As soon as I get home I try doing anything and everything besides my homework, and I don't do it, or wait till last second. If I say Im going to do it, I stare at it, and end up doing something else.

But I changed to doing online school and ....Its like doing HW 24/7
Because Im at home and there are other options to do like facebook ect.
So when I have alot of school that Im behind in,I just don't do it, I procrastinate and I dont know how to stop. This was a HUGE problem last semester. I got bad grades because I got so badly behind.

I need to change this ASAP. This week I got behind because of an essay...and Its like a domino effect. Now im a couple days behind in everything and I cant just do it!!!!

HOW DO I SOLVE MY PROBLEM?!