Here is some advice from the Freshman Survival Guide about making friends in college.
"Making good friends in college is important, but it takes time. Be patient, be smart, and stay connected to your support network - the friends and family who helped get you this far."
It took years to develop the relationships you have at home - do not expect to find this kind of closeness overnight when you arrive at college. "You've been through tough times with your old friends and have learned their strengths and weaknesses. You trust them because they've proven themselves trustworthy. They know and keep your secrets, and you know and keep theirs."
A common mistake new college students make is to create false relationships with the new people they are now sharing their lives with. These new relationships can quickly begin to feel "old" because you are spending so much of your time with them, but in reality they can be an artificial intimacy. "These new friends need to earn your trust. Don't just give it to them. The people you meet in your first few weeks of school may be great, some of them may turn out to be the best friends of your life, and some of them may turn out to be criminals (seriously)". As you progress through the school year, you will begin to realize which ones are gems and which ones are jerks. "Remain open to new friendships, but wait until you get to know people a little before you loan them your car, give them all your passwords, or share your deepest secrets with them."
"There is a tendency to settle in with the first group you meet." They offer peer support while you are going through the overwhelming start of this new adventure. It may feel like they are the only ones that understand what you are going through, so you stick with them. "But the people you choose to be friends with can make a huge difference in nearly every aspect of college life: study habits, interactions with other groups of people, how you spend your free time. Choose carefully and remember you can make a new choice anytime."
A good rule of thumb is that you will become like those you hang out with. If you find that you are constantly socializing and not able to get homework done, look for friends that are more academic in focus. If you find you are studying so much that you want to scream, look for friends that are more social. Balance these groups together and don't get stuck in just one style. And most of all, do not allow the connections you make to compromise the person you are and who you want to be. Remember, this is a small part of your life - don't let anyone or anything change you in ways you do not want to be changed.