I don't believe in aliens, but I could be convinced about Ness and Bigfoot and the Abominable Snowman. :)
I actually agree with you 100%. You don't meet many people that don't believe in aliens. Not that I don't believe that there's any life out there, but I don't believe intelligent life has found it's way from space to Earth.
The existence of the Abominable Snowman is beyond dispute. Here's a picture taken by Yukon Cornelius.