That you’re probably a Slytherin. ;)
There’s a difference between what you are and what you’d like to be. Serpents get a bad rap and are very poorly portrayed in the books, so a lot of people are reluctant to admit they belong in that House. Slytherins are cunning, ambitious, and extremely loyal to those they care about (which is why it contains a lot of xxTJs). There’s nothing wrong with that. Some can be very cutthroat and the House history is steeped in prejudice, but that’s all the more reason to have level-headed snakes in there.
I personally don’t find the Pottermore quiz to be all that accurate. I would base your House on the descriptions, not the quiz, but remember that the Sorting Hat will always take a student’s preference into account. For those looking to fudge the test and get the House you want, this is the guide I use.