Selfish and self-assertive

What is the difference between the meanings of selfish and self-assertive?

selfish:

1. looking after own desires: concerned with your own interests, needs, and wishes while ignoring those of others

2. showing that personal needs and wishes are thought to be more important than those of other people

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1. devoted to or caring only for oneself; concerned primarily with one's own interests, benefits, welfare, etc., regardless of others.

2. characterized by or manifesting concern or care only for oneself:

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self-assertive:

outspokenly assertive: tending to be aggressively confident in making your views heard and your presence felt

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Determined advancement of one's own personality, wishes, or views.

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confidently aggressive to advance one's own views

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insistence on or an expression of one's own importance, wishes, needs, opinions, or the like.

aggressively self-assured

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A selfish person is some what calm.
A self assertive person is aggressive in showing his selfishness.

Selfishness is defensive, and and self-assertiveness is offensive.

and what do u think...what one should be.?