I totally agree on this sounding like a fit issue. I'm guessing the reach to your handlebars may be too far (or they may be too low). If that's the case, you'll feel unbalanced and be nervous about letting go of any part of the bike.

As far as hills go- I never stand up and I'm perfectly happy that way. I often shift around and use different muscles, without actually standing.

Quote Originally Posted by trekin' View Post
Would you ladies clarify why 1) someone would want to stand while coasting and 2) why one would want to dismount while clipped in to one pedal?
1) When going over speedbumps, potholes, and unidentified obstacles. Or to stretch one's back.
2) I hadn't ever really thought about this- I think having one foot clipped in gives you a lot more control- when both feet are unclipped all you can do is stop. If you've got one foot in and there's suddenly something to dodge, you're better connected with the bike and in a position to pedal.