Does it mean I'm gay if the only boys I've liked have been celebrities?

It's a good idea to remember that you'll probably never find any one "thing" that will definitely let you figure out your sexuality one way or the other. What you'll have is just a bunch of data. Hints. Suggestions. And looking at them all will usually give you at least a vague pattern of what it all adds up to. Some things will seem to confirm your hypothesis, and others might seem to contradict it. But that's just because you're a complex human being, like all of us are.

Celebrity crushes are extremely common, especially among the younger set. Reason? They're safe. You get a rough outline of the person (what you see on TV, or on social media), and you can fill in all the blanks with anything you'd like. These celebrities will never turn you down, or treat you poorly, or even be something that you'd rather they not be. So you can moon after that singer all you'd like, without having to deal with "damnit, s/he's on tour for another six months and I won't see him/her until the tour is over".

If you're having fantasies and dreams about women, and are actively enjoying them, I'd say that's a pretty big clue that you're at least not 100% straight. And if women are doing it for you right now, I'd say just run with that. Fantasize all you'd like about them. You may eventually find some guys you feel that way about, or perhaps you won't. So for right now, feel free to consider yourself "not straight, possibly gay".

Lex