Feeling Alone Among Friends

I don’t know how to feel. My “friends” always moan about going down a floor in our college right in front of me when it’s for my own safety and I never put that in plan the staff did. They moan about it in front of me and make me feel shit. Today I decided ok you don’t want to come don’t. So I went by myself. I was there the whole hour. Apparently one of them did come to look for me but never found me and didn’t even bother to text me to ask where I was to be able to find me just gave up and went back. The others all said they didn’t want to go down still so I was alone the whole of lunch. All my “friends” refused to come sit with me because they couldn’t be arsed. And this is a plan for my safety because there is a lot of staff members available to help in case of a fire alarm as I need help on the stairs. They know this yet they choose to repeat the moaning and refusing every week. I’m so fed up and I don’t even feel like they’re my friends. At the same time they’re autistic so I feel like maybe they don’t understand how it’s making me feel so I can’t say they’re bad friends? Idk but I know I’m angry it’s nowhere near good enough