TL;DR: My aunt says she cooks dinner after I get done working but I come home to find she's only cooked a giant-sized portion for herself. I decide to burgle myself some dinner before I go to sleep for work the next day. Relatively minor compared to some stuff I've seen here but still potential asshole territory. 

A little starters. I'm twenty, I live with my mom IN my aunt's house (which is a story for another time) and the power dynamic is a little....extremely off. 

I work at a fairly shitty grocery store but it's only a few blocks from our place so I can walk there easily or bike. It's decent paying but hard work as I'm unloading trucks all day by hand. I've just worked from about 9AM to 11PM and I'm tired, I just want to go home and eat, then sleep. On the walk back I get a text from my aunt. She's said she cooked dinner and I wouldn't have to when I get home from work. Side note, I usually do that, even though my job is actual manual labor, but I do it to be nice. 

I'm pretty content with that, even if it's just cheap brats and chips. Whatever. The thing is, these aren't pre-cooked sausages, they're raw. I get home, take a quick shower and get dressed before heading up and going to grab dinner. I wall past my aunt who has eight of the twelve sausages (and all eight of the buns from the pack) on a plate in front of her, they're all crammed on there and there's no room for anything else. 

I basically ask her if she already out dinner away, thinking maybe I'd had an extra-long shower by accident, and she responds with "The rest are in the package, but they only take like five minutes to cook." I'm livid, this happens more than I'd care to admit and not just with sausages. I buy captain crunch, she eats it, I buy my favorite chips, she eats them, things like this. It comes across disrespectful in my opinion. After investigating the food situation I get even more pissed, thinking she was joking and I decide to do something about it. 

I wall over, quickly grab two pristine, pan-fried brats off of her plate and retreat to my room to eat and sleep before I have to be up at nine again. Heard her screaming at me about "taking the food out of her mouth" and how she "never gets to eat a damn thing" around her house as I shut my door. 

Am I the asshole in this situation? 