Why are my housemates being so unkind to me, is there something wrong with me?

I’d say I’m a friendly person and was happy and confident in a new house share. I felt really happy, and I always help out, I feel like I bring something to a house. I was cooking a lot for people, bought things for the house, check in to see if everyone’s okay, plan birthday things for them. I’m not fake though and I’m my true self. I’m always kind to people and would never say anything to hurt someone intentionally

I felt confident like a new person when I moved in. But then I got a new job and was stressed a lot, I’m still friendly but I don’t feel as sociable. I’ve also had some health issues going on which I’ve been worried about but I’m trying to keep positive

All of a sudden, all of the housemates are talking about me behind my back. I get eye rolls and ignored even when I just say hello. They always shut the door so I can’t come in the living room. There’s no point me bothering talking to them anymore as they just ignore me. Leave the room when I enter and slam the door behind them.

I’m hurt by this and I’m now socially anxious at work too. I’m scared I’m just a loser no one likes. I’ve tried to bring it up with my housemates but they just ignore me.

I said hello when one of my housemates came home yesterday and he shook his head at me, ignored me then slammed the door. It really upset me and I spent the whole evening in my room a bit testy. I texted to ask what’s wrong and he blanked me