Selfish by Nature?

No one can help... I hate this feeling, but it is turning out to be true. The help people offer has just been making the feeling worse. Still the love and friendship people have shown is absolutely regarded with thanks and respect. Other people on the other hand have been exceedingly selfish. While I think it is important for each person to be at least a little bit selfish, it has made me raise my eyebrow more than a few times.

It has always been apparent that the human race is selfish by nature. Does that mean I should expect myself to be selfish more often? I do feel that a fair amount of time I act selfishly... mostly unconsciously...