It comes as a shock when you get diagnosed by chance I suspect. I only found out I had PCa because I requested a PSA test due to my father having suffered with it.
I have been on AS since September last year, but am now being referred for RP as my PSA continues to rise. I know what you mean about the life changes, but am hoping that they will be minor in the grand scheme of things. As Steve says, there are loads of blokes on here who have been through it and shared their stories.
I'm 60, so a few years older than you but still apparently a "young man" in terms of being diagnosed. My choice of RP over RT is largely based on having RT as a fallback plan if they miss some, and the fact that I'd rather have the tumours cut out of me than just deactivated by RT.
Good luck with whatever you choose, and keep us updated.
Ian.