Your story sounds a lot like mine, bucutie. I started at Tulane my frosh year, which is a prestigious private school, that was an hour from home. I went home every weekend and got sick to my stomach every Sunday afternoon. I talked to my mom on the phone for over an hour every night. I had friends that were nice, but I just didn't feel like I belonged. My boyfriend and all my high school friends were at LSU. I finally decided to transfer for the second semester of my freshman year. I cried when my mom left the dorm. I was scared and homesick. I went home pretty often.
But very slowly, I became more and more independent. I joined organizations on campus and had weekend activities at school and had reasons to stay. Gradually, I became more independent.
Are there any on campus apartments or nice upperclass dorms at your school you could live in? It might help to move there as an 'in-between', knowing your parents are just a phone call away.
I understand where you're coming from. I was never ready to leave the nest. I was a national merit finalist, which could have gotten me full scholarships to many schools, but I refused to go because I was scared to leave. Even still, I don't want to work or live far from my family. But, gradually, you come to see that space is nice. Not having your parents around all the time is fun - its so cool to just go out at 2 am like its no big deal.
I guess my point is - take things at your own pace. Get involved on campus and you'll feel like a part of things. It will all fall into place sooner or later. But you're not wierd and you're not alone in not being ready to leave home for good at 18