well.. uni is definitely a fresh start, and a good place to begin again.
but, you feel sad, and you complain that you have only a few friends, you cant break the ice, you dont like large groups, you spend lots of time at home, and your searching for tht special girl.
i think friends the key to it all. if you can manage to break that ice, and just be more comfortable around ppl, you will feel so much more at ease and you will enjoy going out with friends. this leads onto the girls (finding someone you rely like) and then from there, you wont spend time at home so much cuz you will rely want to be out with friends.
so... when you begin uni, use freshers week as an advantage, try and try and try to find friends, its gona be hard no doubt, especially if it doesnt come naturally, but everyone can change. so go for it, try hard, if you want some practice before hand, go out with your few close friends and try to make new ones out of their close friends. it all comes down to you, and how you react.. good luck