Hi Sander,
Many people who are members of this fine website, and who have had hip resurfacing surgery, have mentioned they wished they had had the surgery earlier. I am definitely one of them. I let my hips deteriorate for many years longer than I should have, and by the time I became aware of the effectiveness of the surgery it was a no-brainer. However, I was still relatively active (as much as I could be with two bad hips), and playing some of my favorite sports, right up until the days before my (bilateral) surgeries.
A hip resurfacing surgeon will inform you if you're an acceptable candidate. There is definitely not a *must* requirement to be in constant pain, and nor do your hips have to be completely bone-on-bone. If I were to have known about the very positive results of this surgery (when performed by experienced surgeons), my decision would have been related to the lessened quality of life and restricted athletic lifestyle more so than compared to the pain.
Good luck with your decision.