[CompassionateSoul]

If you are trying to deprive her of time with her friends, then ignoring her on MSN because you're preoccupied with World of Warcraft, she isn't likely to tolerate it for very long. You might want to think about which is more important to you - I suggest you delete your WoW account.
It would be wise to face your 'fear' and spend time outside, maybe you don't live somewhere with much natural beauty so you don't really appreciate the outdoors, but there are probably things to do outdoors. Humour your girlfriend and do some things with her, outdoors.
There are plenty of other things to do than sit transfixed to a computer screen for hours. You could spend that time taking your girlfriend on dates and showing her the real you, not the one who [seems to] ignore her online.
Go and see a movie, no matter what the reviews are, if it's terrible you can laugh about it with your girlfriend afterward. Take an interest in a hobby of hers and spend time doing it together. You may want to go back to the community center and apologise to those people you have made 'hate' you. You might want to explain to your girlfriend why you don't like her being around other guys. She will likely interpret it as you being jealous, which is probably the last thing you want. It more likely comes down to trust, and the fact you don't know the other guys very well. Solution? Get to know them and have them trust you, then you will have less to worry about.