I am so tired of people deciding what foods I want to eat
Do they give you food without asking what you like?
Yes, I don't eat pork and my mom frequently does that without asking, just thinking she knows what I want to eat
It is understandable that you don't want to eat food you don't like. It can get frustrating with people not taking your considerations into account.
No matter how many times I tell her, she still would not change this.
Well you can eat what you like. Have you tried cooking your own foods? Or maybe one night you can cook everyone dinner and they might see a different side of you.