Having trouble with Friends?

I'm having extremely difficult time with my friends or so called friend.

Some of the so called friends I have don't want to talk to me and only want to talk to me when they feel like it and don't want to tell me what wrongs, other I have a feeling to try and distance themselves from me and the remainder only want to do stuff if they feel like doing it or if it only when it suit them.

I find it hard to start talking to allot of friends and other then going out to the pub and drinking on a saturday night I find it also extremely hard to do anything with them such as going to the movies, going for a drive somewhere, camping, etc and I'm feeling really alone that its making me feel upset and sick inside.

I'm 20 years old and I'm over people saying to me people change, they get jobs, have family and don't have time to do stuff like this anymore. Which I believe is rubbish since I seen people who are older then me still able to do various activities like I mention above.