Am I being over dramatic?

So my brothers got a job recently and I decided to be nice and help make lunches for them. I packed them in little lunch bags and everything. Halfway through packing, one of my brothers, C, starts rummaging through his lunch bag. Mind you it’s the night before and I hadn’t even finished. For some strange reason I start freaking out and my heart starts beating really fast so I tell him to stop touching the bag and that it’s messing me up internally. (This also happens when I’m washing the dishes and everything is in a certain pattern [dishes on the bottom, cups and spoons on top] and someone adds a dish or starts “helping.”) He explains how it’s his lunch bag and it’s his food so I can either deal with it or let him pack his own lunch. It made me feel like he thought it was a privilege for me to pack his lunch and that I should be grateful when in reality, I was just trying to do something nice for him. I felt like he was scrutinizing my work before it was done and it made me anxious. It got harder to breathe and I was trying not to yell because I had an anger problem that (I’m still working on tbh.) We kept arguing until the first born brother, A, came in and tried to calm me down, saying I don’t have to pack their lunches. It really only made me more upset but I decided to finish off and go to my room.

Is there something wrong with me? I’m really confused as to why I felt so uncomfortable.