Yeah go, definitely!
Assuming you like parties. Be yourself, hang out with friends. Don't drink if you don't want to. It's all about socializing and having fun. Even partying well is a skill
, so go and see how well you'll do. So you are less insecure at the next party and can party even harder! Don't worry too much about doing something wrong. We all screw up sometimes, if you do, laugh it off and move on.
Enjoy yourself! There is no need to be insecure about this.