Stephanie Mayer is an amazing author, I aspire to be like her, but why can't I write? I try so hard and nothing comes to mind. I frequently get writers block and she never once got it.

she probably has had writers block before but you can't compare yourself to other writers or people. we all have different writing styles and it's okay to be stuck sometimes it just makes you bounce back even better. You will eventually find your favourite area of writing whether it be mythical, non fiction whatever but it will come. You have your whole life for this so please don't downgrade yourself