I don't like selfish people

I try not to be selfish myself, and I often fail, but I'm going to try harder because I don't like when people are selfish and always put their needs and wishes first. When someone really needs help and has to ask for every little thing they (I) need, and sometimes, say, 'yes, really. now would be nice, yeah,' and when I am practically immobile with a bad knee and ankle and you go out and don't get home until it's light outside, and then just pass out, it hurts my feelings and makes me mad. I can walk around slowly, but I'm still sore and swollen, and less steps seems like a good idea to me.