To the OP - I know it kind of sucks. And I know that you will get lots of negative comments on here (so what else is new?). But the truth is that it probably will get better.
I felt pretty much the same way as you when I was your age. Now I have been happily married for some time, have three great kids, am reasonably successful in business, and generally am enjoying life.
So, what changed from college days to now? First off, what didn't change? Me. I am still very much the same as I ever was (and similar to how you describe yourself). What changed is the environment that you live in during college versus in the real world. Once you have a real job, get married, have kids nobody is going to give a rat's ass if you are a party animal. Indeed, the folks who do not adjust to this reality are seen for what they are - losers.
My advice to you is definitely do NOT try to be someone who you are not - don't try to become the party animal because that's what everyone else is doing. You won't succeed because it is not you. But also, DO try to expand your interests beyond running. Running is cool but it is not everything in life. And even in college (maybe especially in college) there are lots of other options that do not involve alcohol and partying 7 days a week. Try rock climbing, a cappella, ultimate frisbee, debate...there are hundreds of clubs and interest groups in most colleges. Go look for one or two that you might find interesting. You'll meet people who can think of having fun without involving either alcohol or running.
And mostly, no worries. It will get better as a "real" adult. But in the meantime, learn to enjoy things other than running. The opportunities in college are endless.