I have this exact problem.
"I have to lie when someone says omg we use to do that all the time or old inside joke I should rememeber."
This is so interesting. I have very little emotions, but I think that my dad is Autistic, or at least on the Asperger's scale, and I'm certain I've adopted some of his mentality. My situation has changed a very little bit. When I turned 16 I actually started to get interests, but my emotions are nothing like others'. I have no friends, and couldn't care less. I make no emotional connection with people, and I can't remember people's names, or things that we've done together. It gets embarrassing and stressful at times, but I'm just being me.
In the end, you really don't have a problem at all, as long as you're happy, and you're not physically harming anyone else or yourself, then just keep doing what feels natural. The people that will accept you for who you are, will stay with you.