Stuck ....Again

This book is driving me INsane! I'm writing my first book and I'm stuck. I wanted to write about my life, the struggles, ups and downs, trials and tribulations, finding me. I've written maybe 7 chapters, but I cant help to wonder, who cares. Should my first book be more of a fiction, action, thriller? To capture my audience, then follow with my biography? I keep telling myself to go ahead and finish this book since I've started, but I can't ignore this feeling of uncertainty. Hmmmm.