True love isn't something you can really, completely, believe in until you find it. It's like believing in unicorns. In your mind, you truly think they exist, but you can't be sure until you find one. And even when you do find it, it takes a while for you to notice that's really a unicorn and not some horse with an ice cream cone on its head. So yea, even when you find it, you might not realize it for awhile is what I'm trying to say XD;
So if the question were "Do you think you believe in true love?" then my answer would be yes. I'm not sure if I've found TRUE love yet. I know I've found love, in more than one person. I've found love in everyone close to me. I've found very VERY strong love in a certain person, as well, but is it true love? We'll just have to wait and see for that.