I ate until my stomach started hurting really bad.
Did something make you want to eat so much?
Yes. I heard my friends shouting from downstairs. But I was fine with that as long as I was eating so much.
You shouldn't overeat to cope with something that bothers you. Maybe next time your friends are shouting you can put on headphones? It can be bad for your health if you rely on food to feel better.
Why?  I'm just eating lean meats.
I see, but overindulging in any kind of food can be bad for your health, even something protein rich like meat.  If you rely on food to be a distraction, you will end up with more of this kind of stomach pain, and possibly worse consequences down the line.  I have to advise that you find a way to distract yourself from things around you, so that you are not tempted to eat.