I want to flee the university now I am studying in

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Strictly speaking,the subject must be "i want to flee the circumstance around me".I am a introversive girl in others' eyes except my good friends.I don't like talking with people I don't familiar to.I will smile to them,but have no topic to talk with them. I seldom took part in the activities or sometimes I made up my mind to do something but ended with failure.Things go on like that,actually,I don't care much about this,I just want to study hard and communicate with my dear friends,go shopping,reading magazines,do whatever I'd like to.but people around me don't like that,they like extravert.I once tried being different,but it is really hard for me. I don't know what to do,change myself and surrender to them? Put my feet down? Give me advises,please!