You are using language incorrectly. Egoism is not what you say it is. Egocentrism is the word you should be using instead. These below are the correct uses of the term Egoism. Can you identify which of those listed you are trying to use the word to describe?
Egoism (Stanford Encyclopedia of Philosophy)
Egoism can be a descriptive or a normative position. Psychological egoism, the most famous descriptive position, claims that each person has but one ultimate aim: her own welfare. Normative forms of egoism make claims about what one ought to do, rather than describe what one does do. Ethical egoism claims I morally ought to perform some action if and only if, and because, performing that action maximizes my self-interest. Rational egoism claims that I ought to perform some action if and only if, and because, performing that action maximizes my self-interest. (Here the “ought” is not restricted to the moral “ought”.)
I'll correct what I said earlier about the use of narcissism to describe what you are trying to say. The correct word is
egocentrism:
Egocentrism - Wikipedia
Egocentrism is the inability to differentiate between self and other. More specifically, it is the inability to untangle subjective schemas from objective reality and an inability to accurately assume or understand any perspective other than one's own.
Although egocentric behaviors are less prominent in adulthood, the existence of some forms of egocentrism in adulthood indicates that overcoming egocentrism may be a lifelong development that never achieves completion.
[1] Adults appear to be less egocentric than children because they are faster to correct from an initially egocentric perspective than children, not because they are less likely to initially adopt an egocentric perspective.
[2]
...
Although egocentrism and
narcissism appear similar, they are not the same. A person who is egocentric believes they are the center of attention, like a narcissist, but does not receive gratification by one's own admiration. Both
egotists and narcissists are people whose egos are greatly influenced by the approval of others, while for egocentrists this may or may not be true.
I hope this helps clarify, unless you specifically meant otherwise one of the first group of definitions of egoism listed above? Otherwise, if you meant the latter, then the correct word to use is egocentrism.