Devoted to or caring only for oneself; concerned primarily with one's own interests, benefits, welfare, etc., regardless of others. DOES THIS SOUND LIKE YOU! If just one word descibes you its not a good thing. Remember life doesnt revolve around you. It revolves around others, including the people you dont like. If you think the world revolves around you then you will eventually be all alone because nobody will want to be around that/you.
Although people want to be happy they fail to see doing for others and caring and respecting others brings that much more happiness. Remember you are always being watched. Is how your acting what you want others to percieve you as?