Though I am a bit of a science fiction buff, occasionally the thought of space travel scares me. To some people, sailing the stars is not only a wistful notion, but a lifelong dream. To me, when I really think about it, I get a definite claustrophobic feeling. To be sealed inside a tin can literally millions of kilometres from anything resembling "help" or "rescue" should terrify anyone.
Taking a holiday in some hypothetical moon or Mars colony is slightly less panic-inducing, but it feels like human beings were meant to stay on Earth. It's made for us. If there's not enough air or water or food where you are, you go somewhere else. In space, all you can do is shrug your shoulders and die.
This attitude is probably the way people felt in the early days of human flight, saying that solid ground is the place for us and that's that. I can understand that my feelings may be paranoid like that, but you'll have to do a lot to get me to jump in a rocket and leave orbit.
Mokalus of Borg
PS - I realise feeling claustrophobic in outer space is a bit contradictory.
PPS - But the amount of space you can use is as big as your space ship.