Welcome to SR.
Many of us found ourselves in similar positions, you are not alone. I also drank quite a bit while at university in the USA, in fact that's where I learned how to binge drink. Unfortunately, I didn't quit when I was younger, and waited until I was 36 to finally stop.
You have a great opportunity to get your life back on track - it might be difficult at first, but many of us have kicked the drink and are much better for it. Do you have any plans on how to stop drinking? Do you have a plan of any kind? Some people think that getting a plan together is the first step: visualize it. How will you accomplish this task?