You don't have to reject every party that your invited to for the rest of your life but you also have to realize that parties are not just a reason to drink. Parties are great, a reason to gather with friends, see family and just relax and have fun, alcohol is not required. Once your at party no one really cares what is in your glass as long as your having fun. Give yourself a chance to gather some strength and time in sobriety and soon enough you will be strong enough to attend a party without alcohol being a big concern. Hang in there and enjoy today.