I do not want to lie to you. Confidence is not for sale. You can learn to be confident and not to be overconfident.
I have realized that it may take longer for an African girl, woman, mother and all other women to realize how beautiful they are already.
How much does it take for a woman to lose confidence?
A demanding society? a demanding parent when you are teenager?
Sense of inferiority caused by either slavery or colonization therefore having problems in self acceptance. Women failing to compliment one another and rather compete? That’s a sense of inferioruty
Do not forget slavery still exist, and modern colonization too. Let alone self enslavement.
Be you, be yourself, love your looks, do not imitate unless it suits you, get to know your body better and there buy clothes accordingly. Never rely on a compliment from others for you to continue.