Don't worry if you're a shy guy... I like being friends with shy boys they tend to be very sweet. Sorry to hear ur not getting on with the guys from work, I wouldn't worry too much about that they sound difficult. I think it's great that you're going to go back to uni. There will be lots of people of all kinds there you're bound to find some that you get along with. Don't pretend to be someone else when you are there, have a bit of belief in yourself, remind yourself of your positive qualities and that should give you more self confidence. As long as you're a positive bloke who believes in himself people will respect you and I'm sure you'll make new friends!