Be positive (nobody wants to meet a uncouth). Just say who you are, say to others what characterizes your expectations, your favorites. Rightly so, because it is YOU who control what you want to be. Write a profile on a dating site, this is about you, it's your description with simple words, yours.
Talking about ourselves, is doing its promotion, advertising? Enticing article highlighting the benefits of the product? No, not at all.
Write a profile on a dating site makes the same approach.
Everyday in yourlife, you talk around, you tell your story.