Aline, get better friends! Almost all my friends in university were rubbish, but I didn't realize it at the time. They sound like your friends - spending most evenings doing nothing but drinking, sitting around, and (worst) playing poker for money, which none of them really had - recipe for arguments and hurt feelings. Ditch these tossers and you'll be happier. It's not the quantity of friends you have, it's the quality. Want to go mountaineering with a friend, well join a mountaineering club or forum and meet some like-minded friends.
Cheers from the land of endless pints getting quaffed in the local.