I cannot remember a day when I did not have a book in my hands . . .
I started out as a beta reader, reading books just to give writers feedback. As it turned out, I found it impossible to read the manuscripts without making corrections to the punctuation and moving words around to make the story flow better.
It was suggested by a several authors that I should be proofreading rather than beta reading, so I did that for a couple of months. I then realized that what I had actually been doing with the manuscripts was copy editing.
With my work, I look for plot and fact errors, correct punctuation and spelling, and make sure that each sentence is relevant and has no loose ends. Also, if a passage does not read well, I make changes to the wording or I move words, sentences and phrases to make the work more readable and cohesive.
Making books better is in my blood, it is where I find happiness and fulfillment, and I cannot imagine doing anything else.