If you learn to listen to your body instead of applying arbitrary rules and limits, it will clearly tell you what it needs. Notice how when you're eating too little, you think about food all the time, feel run down and hungry, workouts and moods are off, and you have strong urges to eat high-calorie, high-reward foods. Notice how when you're eating too much, you feel uncomfortably full, eat mindlessly, aren't hungry for meals, and feel bloated or disappointed afterward.
I'm sure there have also been some days or meals when you've been right on for your needs and felt great - plenty of energy, strong workouts, enjoyable meals, no discomfort or regret after meals, feeling confident with your choices, clothes fitting comfortably. It's just a matter of spending more time in that "just right" zone. If you get out of it for a meal or a day, no worries. That will happen. It's not about being perfect, just about eating pretty well for your needs the majority of the time. If things feel out of whack, you get curious, make a few adjustments, and soon you're eating in a way that makes you feel happy and good again. Keep that up and you'll settle into a healthy, sustainable pattern that produces good results and doesn't make you crazy.