Like everybody else said, it's more than all right to have an obsession with fishing - too many people are unable to find an obsession anything in their life - and learn about fishing, get outside, and have fun. Friends and family (and females) are in a different category, and should be kept seperate. But a healthy obsession can lead to a healthy and happy life.
A few years ago, I was working my deskjob answering call after call about things I didn't care about and was bored with my life, and no direction. Work, go out with friends, have some beers, go to work, and repeat. I had done that nearly my entire twenties. A few years ago I started fishing, and thought about it much like you - my co-workers thought it was ridiculous how often they would see a new picture on my desk of me with a fish or a website on my monitor involving something with rods, reels, or gills.
Today, I'm fishing as much as I can, and have returned to school to pursue a degree in Fishery and Wildlife Conservation - and have not been this focused and excited about my future since I was in my early teens. I smile at all the kids in my classes with their heads on their desks passed out asleep - if only they could find an obsession of their own.
Daryl