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I think a lot of people including myself have had the same issues when first joining. I quit after the first 9 months or so due to the same issues you are having. I then took some personal lessons for a year or so. During those lessons, I could see little pieces of TAC coming through. It was probably then when I realized the value TAC provides. My teacher also thought the lessons were well thought out.
I also want to point something else out. TAC doesn’t really teach songs per se, it teaches elements of songs designed to actually learn how to play guitar, not just how to play a song. It provides the foundation to have the ability to play any song. There are thousands of youtube videos on how to play songs. TAC is different. Also, the skills developed with the TAC system will also leap frog your ability to learn songs.
Use TAC as a tool. Find some fun easy two or three chord strumming songs and just have fun. Don’t try to perfect anything. Just do your best for 10 minutes and move on. Do your best the next day for 10 minutes. Rinse and repeat. You WILL get better if you keep showing up.