Hi Sky H,
If you haven't already seen them, these two articles might be helpful starting places, at least in terms of sorting out what kind of attraction you tend to experience: Just the Basics, Ace: An Asexuality Primer
Too, sometimes it can be tricky to work out what kind of attraction you're feeling because those three categories you described can contain some overlap (for instance, someone may have personality traits that cause you to feel romantic attraction AND sexual attraction). When you've experienced attraction to people in the past (either people you know or people like celebrities), what does that attraction generally feel like? What kinds of thoughts does it generate?