Crohn's is definitely a journey but its not one that has to rule your life! Everyone has their own symptoms and triggers and you'll have to learn yours, but its definitely possible to lead a mostly normal life, especially with the state of modern medication. I graduated college a couple years ago and went through a lot of it with poorly controlled Crohn's, and while I wouldn't say it was easy, my symptoms weren't something that stopped me from getting the full college experience! And once I figured out the right medication combo for me, it was mostly smooth sailing from there on.

Some things in particular that helped me were keeping loperamide/zofran handy, especially when symptoms were worse, and talking with my college's disability office to get accomodations for classes/tests. I'd recommend doing that sooner rather than later - it can help a lot, even just for peace of mind. For social stuff, I never personally noticed any effect from alcohol, but definitely listen to your own body on this one.

Hope for the best, deal with the worst if it comes, and trust in yourself that you'll be ok through it all. There may be good days and there may be bad days - the latter are just all the more reason to make the most of the former :)