Pathological or compulsive liar?

I think I may be a pathological or compulsive liar. No wait that is a lie, I know I am one. I don't know if there is a difference between pathological or compulsive, and if there is I don't know which one I fall under. I find myself lying non-stop and about random stuff. I do it with out thinking, and have tried many times to stop. It can be anywhere from a small exaggeration to make something sound better, like its raining cats and dogs, to a flat out lie that requires another lie to maintain, like I saw something that I didn't see. I am tired of lying. And what makes matters worse, I hate, with a passion, people who lie to me. How can I stop? I am torn between telling my close friends and family but at the same time I don't want them to think I'm untrustworthy. (Even though I kind of am) Any advice and suggestions are more than welcome.