Haven't seen any of my flatmates in two days

They're inside their flats, but I haven't seen any of them since I put in the group chat that someone had been using my food without my permission. so I went to my accommodation reception to report what was going on, and I literally did not understand or see what I'd done wrong. It wasn't the first time something of mine had been eaten by someone else. I didn't accuse anyone, I just said and reported that my food had been taken without my permission...

I thought university was everyone for themselves, I've been super conciliatory and a bit of a doormat in the past that I've been taken advantage of, so I'm doing my best that people don't see my kindness and don't use it against me.

I also don't know if people just don't like me in my accommodation. Once I did something wrong (put the trash in the wrong bin recycling) and then a boy told me that another girl saw me do it, and I asked why didn't the girl tell me? Are they talking behind my back? They also all agreed on a new recycling bin without telling me first.