I agree with The Great Puncia, sexuality is merely a label, that's all it is.
When you're not attracted to people that's know as Asexuality if that's what you're asking though. The fact is sexuality is fluid, people change.
I personally find myself less attracted to people than the rest of my peer group or society in general but I also have a personal view that if I do really love someone, they could be an extra terestrial for all I care =P as long as they have feelings, emotions, maturity, etc...
By those definitions, I'm technically Pansexual and also maybe Asexual but one day I stopped myself when I was thinking about it and just said to myself... "Y'know what? Why does it matter? It's a label and why should I need to categorize myself for the rest of society, I'm not pansexual, I am simply myself!"
Now I just feel happier that I'm not forcing myself into a category, that I'm happy I'm simply myself