It will not be hard at all to go to parties if you do not drink. Many people at parties do drink and to be honest I am sure no one will even notice if they are all drinking anyway. Parites are fun even without drinking as long as you are a little more patient with other people that do drink at parties. Not everyone drinks and if you want to just go out and have a good time that is very much ok. Drinking is not the one factor at a party so jsut enjoy dancing, games, friends, etc.