Why do I turn to booze every time my life is going well?

I wonder if someone has any idea of why I do this. Every time I am doing well in any plan I have in life, I screw it up by drinking too much. And as soon as what it was I was planning on doing has passed I will stop and have a drink every now and again, I understand about self jeopardy, but I have NO idea how to dig into my sub concious to find the answers for why I do it...Any ideas guys, thank you in advance!