Do you need a niche when you first start off as a life coach?

Can I start as a life coach as I am working through identifying my niche? I have been delaying everything even starting an LLC because I have not yet narrowed down my niche. I read the worksheet but I still feel stuck, so I decided to order Expert Secrets by Russell Brunson in hopes that I can once and for all figure out the women I would like to serve. My mind starts going wild and questioning if it’s a good idea for me to just help women and what if I do not gain much clients because my niche is too specific. Is it possible to just become a life coach that serves both men and women? Your feedback is greatly appreciated.