Welcome to SR.
Hangovers seem like a distant memory to me now. I look back and can't imagine how I ever lived that way, but I did, and I did for a long time. All I can say is that you don't have to live this way any longer. You can make today the first day of the rest of your life. You can put alcohol behind you for good, and like many people on this website, live a fulfilling, happy and sober life. There is no time like the present.
How? We all do it in different ways. What is essential to any method is that you make a commitment to not put any alcohol inside you and do everything in your power to stay that way. Believe in yourself. If you want to be sober, you can be sober - it's as simple as that.