Replying to Life plan at 19? Ridiculous

Anybody else think that the whole go to college, pick a major that you want and with that, figure out what you want to do with your life (all at ages 18-22) is ridiculous? Some people that pick basic liberal studies majors are lucky because with that, you can pick whatever job you want (in a general sense) and get trained in that job when you graduate. But for me, the only things that look interesting are pre-professional programs that pretty much set up your life's plan and I'm only 19. How am I supposed to know what I want to do with my life? So many adults I know hate their jobs or are still trying to figure it out, but it's not too often that somebody will make a 180 degree turn in their life as an adult to switch career paths. Anybody else frustrated with this stuff?