Golfing isn't just about scoring, it's about having a good time with your buddies and relieving stress through an active yet not too strenuous workout. Therefore, don't "expect" to play well. A good game of golf is about accepting the possibilities and not expecting the final outcome. Big expectations of winning create too much pressure and that's definitely something you could do without cause then you can't focus on the game and having a chilled-out time. Typically, chasing a score, has the total opposite effect. Concentrating on your score means you are focusing on indecision, which will set you up for a tough ride. You need to concentrate on those factors which you have complete control over and that is hitting good golf shots!
So, concentrate on "the process", instead of getting distracted around them (scoring, other players' scores, what might happen...etc.)