i'm thinking that maybe, you don't need to rush yourself, there's nothing wrong in not being with somebody. you mentioned fictional characters and that makes me think that those ones you can know deeply, you know their feelings and thoughts, and that leads me to think you haven't been able to know a person like that yet. you don't need to be looking for it, some day it might happen that you know someone and you can become friends, and you'll be getting to know your friends little by little. someday you can realise you have feelings for them. and then, only then, you'll feel like you want to cuddle, kiss them, be with them, feel them, you know?
i have thought myself if i was asexual, i was terribly afraid of being in a relationship like that with someone, but that was because of the way i thought about myself. and i never had had feelings about someone too. but then i realised i was wrong, and i didn't need to rush myself you see?