egotism

US /ˈiː.ɡoʊ.tɪ.zəm/
UK /ˈiː.ɡoʊ.tɪ.zəm/
1.

tính tự cao tự đại

thinking only about yourself and considering yourself better and more important than other people:

:
Finding herself world-famous by the time she was 18 only encouraged the actress's egotism.