This isn’t the first time I’ve gotten this question. I really think that it’s sort of the same situation Harry was in in the series. You may have traits that reflect both houses well and may do very well in both houses. I think Slytherin is a fine house, they all are, I have friends that identify as Slytherin. Of course I’m not going to say you just have to accept it and move on because I know I would have a hard time as well, but maybe think about all the good things that make up a Slytherin (also applies to any other house) that apply to you, and also keep what makes you a Hufflepuff.