Why is my hair like this??

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Hello, so last year i noticed that my hair was getting a little weird; i had long hair but it grew fine on the top of my hair but it started to get thinner from my ears zona to the end.

This year i decided to cut it short to see if it grew better, but somehow, by bangs area and the back of my head is growing just fine, but in the middle it started to fo the same thing as last year and i dont know why!!! Its very frustrating because it gets this crazy wavy look that i hate! I already went to a professional hairdresser and she told me that my hair was not damaged and it could be just a change of my hormones but like......its been a year and its still the same!!

I have some pictures to show you what i mean. Please someone help me because i dont know what to do!