Other than buying a lighter bike, here are a few things to think about:

- Do you ever ride with a group to a) see how "fast" they bike your hills and b) get tips from more experienced riders?
- Get out of the saddle to climb? I've noticed that a lot of riders (especially women) never stand up. This is the only way I can ascend some hills!
- Don't label yourself. If you go into every climb just waiting to be defeated, the climbs will defeat you every time. Cycling is a tough sport and part of being a successful climber and cyclist is learning how to suffer and how to talk yourself through that suffering.
- Do a little research. Roadbikerider.com sells cheap tutorial articles. I've read their article on becoming a better climber and it's quite good. Otherwise there are specific books and cycling magazines that have specific workouts for climbing. Watch old Tour videos too for technique. And just hang in there, realizing that every year you'll gain more fitness and the more miles you put in, the stronger your base (and overall fitness) will be.