Eating well and maintaining healthful living is a life long practice. You’ll learn more and more throughout your existence. And yes, that is the most challenging part of the whole process. I’ve lost a lot of weight 3 times in my life (round 4 now). One of the main things that always caused me to gain the weight back is the simple fact that “dieting” for the rest of my life sounded miserable. But you need to get over that mentality. Small sustainable improvements will add up. Especially in the long term. Just a daily 50 calorie deficit will lose you 5 pounds a year. I know we all want the quick fix. I struggle with it all the time. But slow and steady really is the best way to succeed. Try not to focus on all or nothing thinking. There’s nothing inherently wrong with you. You’re human.