I just graduated from a state university a few weeks ago and I cannot lie to you that it is tough at times. But having a Godly, positive attitude toward this season of your life will help you make decisions to do only the things you want to do.
The pressure will be there, however,(it would be naive for us to not warn you of the ups and downs that come w/college lifestyle and how they can affect your faith) and staying in the Word will keep you close to God (when you draw near to Him, He draws nearer to you). But remember, even if you do stray off and do something you didn't intend to (because I'm pretty sure you're human), God's grace is sufficient. Recognizing that you have value as a child/co-heir in the kingdom will bring you out of those times that you may have regrets.
Some practical things that I stuck with during my four years at state:
1. Seek out an older person (can be an elder in you church or a Bible study leader) whom you can trust, and has been through college, and have regular meetings with them if you can (I understand that the college schedule will get crazy busy, but it's worth it to have a person you can consistently come to). God blessed me with a mentor/discipleship leader since freshman year and we still meet every Mon. night for Indian food and fellowship. She challenges me, holds me accountable but she also loves me and has been in my shoes before.
2. Join a local church. Even if you don't know a soul there and you're far enough away that you cannot stay connected at your "old church", this is a time in your life where you're expected to try new things, get out of your comfort zone and meet new people. If you're in a college town, there's likely a few churches nearby that many of the university students attend. And don't just join it for the service, actually get involved! Become part of a ministry or volunteer. (great way to meet people)
3. Practice prayer. Spend time in the Word of course, but do not neglect your prayer time with the Lord. And I'm not just talking about talking at Him like you're placing an order; I'm also talking about
listening prayer. Take time with Him to learn what that means for you.
4. Become active in a club of your own interest. Don't limit yourself. While campus ministries are great, and I was a part of a few for my first two years and i met amazing people through them, I also found that it was important to God that I branch out and bring Christ into other organizations that were not religious in nature. You can be a light in the darkness without compromising yourself. If you have an interest in something, ANYTHING, try it out. You're young and you're about to have a lot of freedom to try out as many new things as you can handle. I say go for it!
5. Stay pure. If that is what you want for you and your future spouse and you believe it is what God wants for you, then just do it! Don't make up excuses or make compromises. It's not impossible to remain a virgin throughout your college years,and if it's what you want and you maintain it, be proud of yourself. But don't forget to pray for God's strength in that area, because the temptation will likely come.
Don't forget God's grace or the gospel. Look for Him everyday, and He will bless you for passionately seeking Him out.