Don't worry! This is an exciting and amazing chapter of your life. And as any transition goes, there is a required amount of anxiety.
But as everyone has already told you, everyone is in the same position. I lived in a suite at a UC school my frosh year. I loved it. I loved that I had a roommate because she was my dning buddy all first week. I was terrified of venturing to the commons alone. Haha.
-Play your music and keep the door open.
-Cook some food with your roommate and invite your suitemates or the guys across the hall to enjoy what you have made.
-Make friends in your sections with whom to swap lecture notes with in case of absences.
-And since you have been posting on a greek message board, I assume you are not adverse to rushing, so I urge you to do so.
UC's can be a bit overwhelming and somewhat impersonal at first, but as at any college, it's the people you meet that make the experience.
Get exited. There are so many opportunities!