My dad is mad at me because I don't want to have children?

I'm 19. I don't want to get married or have kids. I told my dad this, & he doesn't understand that I'm asexual. I don't ever want to be with a woman. I have no interest in sex. He told me that I'll be lonely & depressed. I figure that as long as I'm happy, it won't matter. Really I think marriage is a joke. Noone saves themselves for marriage anymore. Babies are born out of wedlock. What's the point of marriage nowadays? I'm happy being a loner. I was bullied in high school because I didn't party. I spent my Friday & Saturday nights at the gym working out & studying. So basically I am ripped & I make good grades. So they were envious of me. I'm going to college in the fall, & my dad wants me to get a girlfriend. I don't want one. Why can't my dad just leave me the **** alone?