Most importantly, you miss the space and comfort of your own home. I have some friends here that missed their houses so much that they decided to partition their 12' x 12' dorm rooms into a kitchen, living room, and bedroom with masking tape to pretend they lived in a house. Along with teaching you about academics and time management, college teaches you quite a bit about life and relationships. Your residence hall becomes your new home and the members of it become your family. Each dorm room is representative of each family member's individual bedroom at home.
Dorm life is a bonding experience.
You eat, sleep, shower, attend class, and do basically everything with these people. You cannot get away from them. They are everywhere you go. In a short time you will find yourself closer to some of your friends at college than you were to many of your friends from home that you knew for years. You will find yourself sharing with them your deepest and darkest secrets.