It’s great that you realize you have a problem.
I would first go to your college’s counseling center and talk with them.
As far as your friends go, I would ditch the first bunch…They are just drinking buddies…not friends.
Check out this link on drinking buddies vs. friends http://soberbastard.com/friendsfamily/friends-vs-drinking-buddies/
Next for the second group…decide if you can deal with them…maybe you will learn coping skills and stop the self-flaggelation when you are around them. Or try to connect to your first group again.
Consider if living in a substance free dorm is a possibiilty.
Go to an AA meeting.
Start thinking about your goals…what do you want in life?
Who will help you get there?
Is being in a sorority the thing for you?
Are there other people in your sorority that don’t drink as much?
Check out this link on how to do well in college:
http://talk.collegeconfidential.com/college-life/1920853-college-is-a-step-up-from-hs-16-tips-on-doing-well-in-college.html
Talk to your parents. They may have ideas for you.
Like if my daughter said she wanted to spend more time with the friends who study, I would find a way to get her there (Uber?) and then monitor her grades to see if it works.