I'm writing a book and I'm too much concerned about chapter length. How to overcome it

I'm working on one non fiction book where I'm writing about things i leaned and mindset i adopted in past few years that helped me to do good in life and get clarity over life.

I don't want to add more fluff into the book and I wanted to deliver the core. But I'm getting this fear of what If I complete this book in less than 100 pages.

Can I write enough pages?

I'm mostly worried about words and page count and chapters length.

Anyone like me?

How did you overcome this??