I know exactly how you feel. I am 24. I don't have anything in common with my parents, either. Also, I have hardly anything in common with my sisters and brother, and I have three. It's like we're from totally different worlds.
My mother has bipolar disorder, is overly paranoid, constantly conjures wild, perverted fantasies about what other people in her life do in private, is extremely negative (her negativity permeates you when she is merely standing next to you), cannot control her spending habits, frequently tries to make others feel guilty for doing things that she does not approve of, and wants everyone else, even her own children, to fail at life so she doesn't feel so much of a failure herself. I don't know anyone that enjoys being around her.
I love my father, he is very kind and has always been there for his children. But he is socially awkward and we basically have nothing in common. He can be very judgmental and has this famous "disapproving" eyebrow raise stare that he likes to give us on occasion. Unlike you, I left college after a few years to start a business. Not because I don't appreciate the value of a good college education, but because I was spending thousands of dollars a year on college when I didn't even need a degree or connections for what I wanted to do. My father feels that if you want to be successful you must get your college degree. Both of my sisters attend college and my brother is about to enroll next year, so you can imagine how my father looks at me as if I failed at life.
It seems as if my family is out of touch with reality. My two sisters hardly have personalities, they rely on their beauty to lure guys and other girls who envy them into their lives. They have a lot of "fake" friends. Making appearances and maintaining their images is what they live for. They are both expert manipulators and they use this skill to take advantage of others in order to get what they want. It really saddens me because I know we are related and of the same blood and I feel as you do. I feel guilty and upset for disliking them so much. But I really can't help how I feel.