Everyone has their own brand of sexuality and romantic orientation. It is not as linear as people think. Personally, I find the need to categorize people's sexuality is an old practice and people need to get off their high horses and just accept people for who they are. That being said, if I had to categorize myself I would be a demisexual as I do not form any attraction romantically or sexually towards people unless I have a strong bond with them.
For anyone that is confused about their sexuality or by what different terms mean, think of it like ice cream. Let's say heterosexual like chocolate, while gay or lesbian like strawberry. So bisexuals would like both and pansexual just like ice cream in general. This leaves asexual as disliking ice cream or absenting from ice cream forever, and demisexual as having a mild form lactose intolerance so they need to take medication (take time before) they can have the ice cream.
Now what's the difference between sexuality and romantic orientation? To put it simply, here is an image that describe each of the orientations and the different forms of each one:
It's not always easy to admit your orientation as unfortunately not everyone is accepting of who people are. I used to think there was something wrong with me because I didn't feel any attraction towards people unless I knew I could trust them with my life. But when I learned what a demisexual was, I knew that was me because it made sense. There was nothing wrong with me, I'm just not an orientation that feels attraction right away. And I'm okay with that. And you should be okay with whatever you identify with.