You can write your book if you are willing to have a regular work schedule. Do not depend on "inspiration" or your emotions to get the job done.
Remember, if you were to write one page a day, it would probably be done by the end of the year.
It's the regularity of the work that will get you there.
When you write, quit while you are excited and writing easily; don't quit when you are feeling burned out after an exciting burst of "inspiration." That way you will be excited to continue when you pick it up and start again. As you finish a session, while still excited and energized, make notes about what comes next. That will get you going again when you get back to it.
Work in short sessions if you are new to writing. A typical amateur mistake is to work for too long, get tired and burned out, then put away the manuscript or typescript and never "find the time" to start again. A 15 minute session can accomplish a lot. 30 minutes should be your outside limit.
Beware of your work habits if you find yourself saying things like: "I'll get started on it (or get back to it) just as soon as __________________." (Fill in the blank: "...as soon as my mother-in-law leaves and goes back home" "As soon as the holidays are over" "When my son leaves for college" "After I finally clean up the garage" "When we're done with the remodeling") The truth is that no normal life allows time for things like writing a book; you will have to make the time. Fortunately, you will only need to do it in short sessions in any regular persistent pattern, like three days a week for 15-20 minutes. Don't wait for life to allow you to do it; it never will.
Before you write, it can be helpful to scribble down a bunch of notes about the things you want to write about. Carry a small notebook and pen with you and write your ideas down as they come to you, or use a recording device if you're in a car. If in company, use the bathroom to jot down your notes.
To interest readers, you will need to interest them in you since you are the main character in your story. In fiction or non-fiction, people will take an interest in the story when they know the character or person it happened to. So make a point of quickly and succinctly letting your readers know who you are and what you are like in a few sentences or in the first paragraph. Do not postpone this; do it immediately, right at the very start.
Do not worry about how well you are writing--because you can always rewrite anything. Getting the job done is far more important than being perfect or trying to be a literary genius. If you are really underconfident, and stuck, give yourself permission to write badly...andget the job done.
You can message me any time if you need any encouragement.