AITA for not sharing my food?

So, I was hanging out with my roommates and one of them asked me to share my dinner. I said no, which caused some tension. <br><br><br>Not sharing food is like the only boundary I hold on to. Growing up, my family struggled financially. Whenever I went to my friend's houses, their parents would offer me food and I didn't want to take someone else's food so I wouldn't leave them with less. Then, it would make me feel like crap that they were giving their food away and I'd end up not enjoying it because I was so worried. My mom noticed and told me I didn't have anything to feel bad about and that I should take food when I'm invited over because they want me to feel welcome. But, for some reason, it really bothered me. <br><br>As an adult, I still don't like taking food that isn't my own and it's actually something I'll refuse. It has to be my own food. Today, though, one of my roommates asked to try some of my food because it smelled good. I told him I wasn't okay with that. He got upset and accused me of being selfish. Now, my house is quiet and it's weird.<br><br>I feel bad. Maybe I was an AH.