Yes, golf can be frustrating. Shots you were sure of last week seem to have disappeared. Your confidence level goes down. The last time you played you hit the fairway on every par 4 and 5. Every one! And today, you're visiting the rough too often and that slice (or hook) is rearing its ugly head again.
But your next shot, from the bunker, rolls up to the pin and drops in. Those are the shots you should key on. Your level of confidence will immediately go up. Success comes from not giving up.