WordNet sense 1 (characteristic of those having an inflated idea of their own importance):

egotistic, narcissistic, self-loving

WordNet sense 2 (concerned chiefly or only with yourself and your advantage to the exclusion of others):

selfish

WordNet sense 3 (characteristic of false pride; having an exaggerated sense of self-importance):

conceited, swollen, vain, self-conceited, swollen-headed