I think I'm a compulsive or Pathological liar?

Please dont respond unless you plan to be constructive, I am honestly seeking some help/advice. O.K. So I find that when confronted with almost any negative situation involving my self image, my first instinct is to lie and its really affecting my life. I can't help but lie to save face, and as a result I'm making dumber and dumber and more selfish and indulgent decisions because I've become so good at lying that no one but I will know about it. I feel like I think as long as everyone thinks Im doing well, its o.k. regardless of the fact that Im not. My family thinks I have a job, and go to college still, and neither of those things are true, infact I've been borrowing money from relatives discreetly and stealing money from my roomate to pay the my share of the bills. This has not always been so and I feel like I've lost myself, I dont know where I went wrong, or why. How the hell did this happen to me? I am young, (20) healthy, fairly intelligent, (when was in school I graded and tested exceptionally) for whatever reason, I just started completely self destructing and putting up this facade. I feel like I care more about everyone else THINKS I'm doing than how well I am actually doing.