OMG........Am I the ONLY 1?

So my biggest nemesis in this game is in my mind. I can praqctice, watch TOM show how simple it is, work on basics and whatever............then go to the course and look like I have never swung a club before!! So frustrating. I am so mechanical in my swing, too many thoughts, not relaxed and fluid and just get so frustrated because I know other days I can hit good shots. The inconsistency of this game is killing me and has for so many years. I always have had ADHD and believe at 72 the adult version of this destroys my focus and calm mind. Wondering why I even spend the $ to do it sometimes LOL................