Can someone please help me?

I have been masturbating for nearly five years now, it used to be four times a week, now it is supposed to be none. On my eighteenth birthday i swore i would give up masturbating because it makes me feel like slime and like im flushing my family name down the toilet. I just cant stop, i'll get to two or three weeks w/o it but then i will be possesed by someone i dont know. When i resist these urges i feel empty, sick, and bloated; when i fulfill them i feel i'll and sick, and like slime and i dont know how to kick the habit. I have a block on my computer but it doesnt work for all sites PLEASE I NEED ADVICE.