You can change it later, it just takes a long time to realize it, at a huge financial cost. I chose wrong, but I was lucky that I realized it so soon, after only 6 months. It was a decision made out of laziness as much as anything. I realized that the one programming class I took was way more easy and fun than anything else. I should've gone into CS right away, but for some reason I thought I was way behind the "nerds" who would go to CS, the people who had been coding since they were 6. I thought that I would have no chance in that environment.

That said, not everybody wants to, or can become an engineer or scientist, and they shouldn't. If the choice for a person is between not going to college at all, and going for a humanities education, I vastly prefer they go for the education. I think people getting educated and pursuing their passions are a good thing for society as a whole, if we can afford it.