what would you be most upset about people thinking about you and why

What would upset me the most was if people thought I was selfish.   Maybe its my own guilt/insecurity makes me wonder this at times, but I'd really hate for it to be true.  I like to see myself as a giving and helpful person, but if other saw it as something else, it would upset me.  I do, do things for myself, sometimes before others, but I feel that if you don't sometimes, you miss out and others can take advantage.   Now that has happened to me a lot over the years, but as I get older, I have realised this and am not going to be a doormat for anyone.  So I don't really see this as being selfish if others did.