Most of us are consumed with our own thoughts and desires and are not always thinking about what other people may want. This is not necessarily being egocentric; it is just being human.
Enthusiasm is not the same as just being excited. One gets excited about going on a roller coaster. One becomes enthusiastic about creating and building a roller coaster.
Every day, people settle for less than they deserve. They are only partially living or at best living a partial life. Every human being has the potential for greatness.