Grammar pop quiz: Are You Entitled?
I realize that "entitled" sounds fancier than "titled," but there are many folks out there who will cringe when you use it this way. (Myself included.)
A common thought process amongst would-be grammarians on this word usage prefers to use "title" for, well, titles, and says that you are "entitled" to certain privileges. Your book is titled with a title. Your boss's spoiled children feel entitled to all the good things in life.
However, a little delving into dictionaries and grammar sites can show that—against my personal preference—you can actually use either word when referring to titles. Merriam Webster gives a nice explanation. Just be prepared to defend yourself if someone challenges your usage! Or make life and your sentence simpler, and state "I self-published a book, How to Make Lots of Money."
Now that you have that lesson down, you are entitled to a nice break with refreshment!