I can understand your feeling you made a mistake, but it will get better. I had the sleeve 7 weeks ago and I have benefited so much. I am 63 so being younger would be harder and make you feel like you are loosing out. It will be worth it as you will not develop illness related to being overweight. At 3 weeks you might not feel that good and the drinking so often in small amounts is tiring. If you stick with it, you will be happy. Things get easier and food restrictions get better. I just want to encourage you to hang on and keep following the diet.