I'm 31. Most of my current friends are in their 20s and early 30s.
They are all sober. I met them all in AA. A young people in AA group.
Isolation is clearly a trigger for you. It's becoming a paradox. You isolate because you're afraid that if you're around other people, you'll drink. But then the isolation fills your mind with insanity.
I'm the same way. I completely understand.
You can't hide in your apartment forever. Even if you don't drink, you'll be miserable. That's no way to live a sober life. You deserve a happy, sober life.
So I'm going to keep saying it until you tell me to shut up. Go to your AA meetings (I'm assuming there are some young people there, given you are on a university campus; if not, find a young people's group), put yourself out there, talk to people, get numbers, call, and just see what happens. Don't set yourself with expectations of failure.
I promise you with all my heart that if you do the above, you will be pleasantly surprised at the results. There are people out there who can relate to you and will want to spend time with you in sober situations. You just have to put in the minimal amount of effort to find them.
Take that first step.