Congratulations! You've got it just right!
The idea with short rows is to add rows, not stitches, to increase the length without adding to the width. If you look at what you've knit you should be able to see that the sleeve you've started is longer at the center (top) than at the end stitches. I've not tried sleeves like this yet, when I get around to doing them I hope you'll help me out.
Short rows fall in the category of I had to do it to see how it works. It sounds like they might be the same for you.