Selfishness?

I know we had this discussion in class, but we seemed to stop half way through. In the class discussion it seemed like we were deeming everything as selfish such as - if someone volunteers and then feels good about the work they did, they are selfish. The problem is that I don't really think that is true because it may be a little selfish, but it does not hurt anyone, and it still helps the people that were helped by the service just as much. If we say that this is an example of selfishness, isn't everything selfish? - When you feel happy, that is selfish. When you feel sad, that is selfish as well.

Personally I believe that selfishness has more to do with actions than thoughts. It is very possible to have selfish thoughts, and those are wrong (such as "I am better than everyone else") but I think it is mainly in what we do (or fail to do). Feeling good about doing something that helped someone else is just a natural reaction that is part of the human condition, not a selfish thought.

But what do you guys think about selfishness? If a person is not completely selfless, are they completely selfish?