I can relate to you a lot! The advice about joinging clubs etc is very good advice! You can relate to people easily and meet new people through something you enjoy!
Each day is hard isnt it, its really hard for me when i keep seeing people kissing, holding hands etc, makes me feel jeolous aswell! But dont worry, its perfectly acceptable and it will get better!
Uni will give you lots of new chances, and before then you will surely meet a few girls!
just hang in there and bide your time, and i bet when you do find someone, two will come along at once! lol!
Good luck!!!