Why is making out/ so boring for me?

I never kiss or have with anyone I don't want too, but it's always kind of boring. When I have I don't really feel anything, except a pressure, little pain, but once that's gone it's nothing. When I kiss someone, okay, lips are touching lips, but no matter who I kiss it feels the same. I don't get any pleasure of it. It's like a handshake. Even if it's someone I've had a crush on or something. During and afterwards I'm just like...meh.