Straightening your hair can damaged your hair the more you do it, so you could try and get a fringe, or something at the front of your head, so you don't look like a boy, i used to have this problem to! Just got a side frings put in at the hairdressers! And it really helps!
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have u tried to perm your hair, if this doesn't work, maybe it is the hereditary. you can fulfill your dream to have a straight hair by wearing a straight hair wig.