I'm guessing from your username that you like a spot of rugger? And, if so, I'm making a further assumption that you're built accordingly?
If I'm right, I have some bad news for you... You will always find those steep climbs hard. It's a matter of physiology. Your muscle mass will work against you as your cardiovascular system has to work harder to push the extra weight up the hill.
I speak from bitter experience; I'm built like a middleweight boxer, but with bigger legs. I can blat up Box Hill at a pretty good rate of knots, but something like York Hill or Sundridge Hill has me up off the saddle on the granny ring, pumping away, blowing for tugs and swearing.
To echo what everyone else says; you can get better, by practice, practice and practice (and by losing weight, but obviously that's easier said than done if you're low in body fat already but carry a lot of muscle). However, it's always going to hurt, and you'll never keep up with those 6' 3" stick insects whipping past you and turning 90rpm (till you get to the descent, anyway).