Self-centered

You wanna know the simplest meaning of being self-centered? Observe a toddler. Observe the way he or she constantly asks for things that will give instant gratification, without even bothering to give back anything in return.  Observe how he always serve and work only for his needs and convenience. As we people studying linguistics say, toddlers practices the most perfect first person "I" point of view in speech, and even in deed. It takes so much for them to change. Over time, children learn and improve this behavior. But there are people to gets stuck at this stage...making no bones of anything else but themselves when they are way past childhood.

“It is not because the truth is too difficult to see that we make mistakes... we make mistakes because the easiest and most comfortable course for us is to seek insight where it accords with our emotions - especially selfish ones.”

- Alexander Solzhenitsyn, Russian novelist, Nobel Prize for Literature (1970).