Too little food?

Hello!

I am 19 years old, 6'6, and 291 pounds. I originally started eating only around 2000 calories a day, and working out 5 times a week, which resulted in me losing 19 pounds in 3 weeks. I've seen a lot of things floating around about "TDEE's" and "BMR's". But I'm not exactly sure how all of that works. Am I eating too little? I don't feel I am, I get full with a few hundred calories left each day. Any advice would be helpful!

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