First, I didn't think you seemed ungrateful, just reminding you to keep things in perspective. I know you said first world problems, but that kind of adds insult to injury. Some people live in a "first world" and would kill for these kinds of problems. For example, the kids of Harper High School featured on "This American Life." If you have some time to spare, I'd really recommend listening to it. It's powerful stuff. (Links to part one and part two).
If you think about it, I mainly live alone. While my house is technically under my 22 year old brothers name, he's never home as he is pursuing a graduate degree in college. So of I go to Princeton, live would be pretty much the same. I also don't like living alone, I'm a relatively sociable person and I like to talk a lot, which is why some of you guys get annoyed on the server when I type so much lol
samurai also brought up a great point. It's not the idea of "living alone," but the idea of being a "commuter student" that doesn't live in the dorms. You'll make life long friends in the two years you spend living in dorms. Living on campus means you eat together, sleep together, work out together, study together and have fun together. No matter where you go, I'd strongly suggest living on campus for at least one year -- especially if you're saving $200k by not going somewhere else.