My parents don't like my girlfriend...?

Maybe you should explain to them the reason why you've cut contact with your friends. Tell them you've outgrown the friendships you had. Being at college and also being with your girlfriend has made you realise that the people you were friends with, weren't really the best people to be around and you want a better life for yourself than the way they were heading. Maybe they just need more of a chance to get to know her. If she sees them more, she might come out of her shell a little bit. Overall, if she makes you happy, your parents will see that and grow to like her.