You actually love climbing, it's what cycling is about. You just haven't realized it yet. When have you ever finished a long flat stretch and felt elated? Compare that to the feeling of cresting a really tough bastard of a hill.

Just keep doing it until you're addicted and everything will be fine.

Or you can do what I did - do a century on a fixed-gear bike that makes it really difficult to ride up out of the saddle on the flats and downhills so that your poor sore ass is delighted to see an uphill stretch where you get to stand up and crank for a few minutes.