I am doing Home on the Range fast track using all barre chords. So on the track, the song goes for two times. The first time I could do well. But once it starts the second time, my thumb (rather the muscle between my thumb and the wrist) starts hurting. I have been practicing on it for about a week and there's no improvement in less pain. People say it is wrong to put a lot of pressure on the thumb, but once I loosen the thumb from my normal pressure, the strings start buzzing. Or if I balance the thumb pressure with the forefinger pressure, giving more pressure on the forefinger, the guitar neck starts moving towards me and it starts getting out of balance. I watched the Ben Eller YouTube video on barre chords and tried his suggestion but still, my thumb hurts once the song finishes its first track and repeat to the second one. If you had the same problem, please share me how you overcame that or if you have any opinions that might help me, I would greatly appreciate it. Thank you.