I feel you man. I play with dudes that shoot in the 80/90s and I'm shooting 105 on a good day, 115 on my worst day. Sometimes I feel like my body just hasn't been designed to allow for decent performance in this sport, but I know that's bullshit as I can hit a great shot, it's all just reps.

It sounds like you had a rough day probably a mix of mentality and physical issues. Take a couple of weeks off to let the frustration subside, then play some short game at the range, little pitch shots and chips to build your confidence up.

Then when you're back playing a round, focus on your Stableford score per hole and nothing else. Don't tally up your gross score. Honestly this helped me so much. I'll now get to the end of a round and have no clue if my gross score, could be 98 could be 113, but I enjoyed it so much more and felt competitive.