Here's what you can do:
a) Gather some of your better posts online
b) Put them together as an e-book on Amazon.
I did it twice.
In just an hour or two, you're an Author, you have an ISBN
number and honestly, you can get the "I need to write a book"
out of your system... or at least give it some relief.
I still want to write "THE BOOK THAT WILL SAVE HUMANITY" [my
someday title - no stealies... pleasies...or.. at least give me
BIG CREDIT] - but by going through the process of getting
published, you'll see that YES YOU CAN DO IT.
The rest? Is marketing.
And if you don't like it? Take it down.
It gets part of the equation completed; the fear of the process
and the need to "GET IT RIGHT THE FIRST TIME".
Just do it. Get it wrong. Make it fast. It's practice. It helps.