I was very nervous at orientation but I made some good friends that I still know today. Keep in mind that a lot of people there don't know many people either. Everyone wants to make a new friend, so if you have ever wanted to just go up to someone and say "Hi I'm John", this is the time to do it. Ask them what their major is, what school they went to, if they know anyone there, where they're living next year, etc. Orientation is the most welcoming time at university, you can choose to make it a good learning experience. Take the small first step and say hi.