For your sake: I’d find friends who share your faith, because they might provide much needed support (depending on the climate on campus, they can make or break your experience). Join campus ministry (if there is one). Visit the local parish. Don’t miss mass, and go to confession regularly. Read up on the faith. College is a great time to start or delve deeper into a study of the Bible, the Catechism, important encyclicals, ect. Read a couple apologetic texts and some “must reads” like Aquinas’ Summa.
As for evangelizing, don’t ever hesitate to defend your faith in class (and in philosophy, it WILL come up). You don’t need to make it about you or specifically state “As a Catholic…” or whatever, but don’t let arguments against faith slide. Always use reason and logic to uphold the truth (I recommend doing some reading to help out). It’s much more credible for others if you use a logical argument (which will exist, because reason enlightens our faith) than to say “In the bible/catechism” for obvious reasons. Among friends, let it be known (in a really casual way, not artificially) that you’re Catholic. Don’t ALWAYS talk about religion, don’t act like you’re trying to convert people. Just be a normal, smart, funny, friend that happens to be Catholic. You might be surprised at how many people will start asking questions. Don’t go on the defensive or launch into an excited preaching explosion, as that’ll scare people off. People in college naturally start thinking about the “big questions” and, especially if you’re one of the only Catholics they know, they’ll ask you stuff to satisfy their curiosity. Answer them as best you can, using reason and being calm and a good teacher. If you don’t know/understand something, admit it and offer to look it up. Don’t just say “there is no answer” or “it’s a mystery” or make something up.
The most important thing is to be the best you can be and to continue actively living the faith in all aspects of life. Be kind, work hard, be a good friend, ect.