Publishing Ebooks

I, like many other writers, are in a very exciting time. I could compare it to some very historic times like when the slaves were freed, women were able to vote, or every teen who ever got his/her license. I don't know if this time for writers is as BIG as those. So I will stop being dramatic.
I, however, am published. Self-published. I am published. I did not have to spend one dime to get published. I just needed a computer, a story, and the knowledge to do so. I have published ebooks.
A few weeks ago, I read a comment regarding one of my books that was from a stranger. I knew it was a stranger and not a family member, because it was a harsh comment. Although I am no stranger of hearing harsh remarks from family and friends, I am pretty sure it was a stranger's review.
Although it was a 2.5 out of 5 star review, I was estatic. Why, because a stranger read my book. Scratch that he or she read half of my book because he did not read the whole thing and he/she made the point to say that.
Another reason why I was happy, was because the reviewers stated he/she was not satisfied with the book because of his/her expectations. I went back to the description of the book, and realized it seemed to be his/her assumptions that led to those expectations.
Anyway, publishing ebooks has consumed my days and nights with writing. My thought in between appointments, in the lunchroom, in the bathroom, walking down the hall, are stolen by my character's thoughts. No, I do not think I am delusional or experiencing psychosis, but if it makes me writer better, why not.
I am a published author. Self-published, but aren't I my worst critic?