No, you are NOT crazy! I was a sendentary, overweight 40-something before I was encouraged to start running by my marathon-running older sister. Never thought I could, never tried before -- but I did it! And once I started, I got hooked. Now, I'm running half marathons and shorter races regularly and loving it. Last night, I was putting away my latest half marathon medal (got it Sunday) in what I call my "box of glory", with my assorted finishers medals and trophys from age group awards in various 5K and 10K events. My husband said, "See, you're an athlete!". Who, me ??? It's still hard to think of myself that way.
There really is an addictive quality to it (in a positive way) -- when you see yourself getting stronger, leaner and faster, you want to try harder to improve more. Finishing a race event is an incredible feeling of accomplishment, especially for someone who was never particularly athletic before. There really IS such a thing as a "runners high", and once you've experienced it, it keeps you coming back for more.
John "The Penguin" Bingham has written some very helpful books for "adult onset" athletes: "No Need for Speed", and "The Courage to Start", are a couple. He gives wonderful tips and inspirational stories for beginners. He also has a web site at:
http://www.johnbingham.com
Runnersworld.com also has a lot of training resources and beginner info.
There are lot of great benefits to becoming an adult-onsent athlete:
-- No pre-existing sports injuries, everything is "fresh meat".
-- You've never done this before, so every event is a new lifetime personal record, no younger days of glory to haunt you
-- You don't really know what you CAN do, what your real potential is ... so training is exciting when you find yourself doing things you never thought possible. AND,
-- When others' abilities may be declining (because they are slacking off), we are just getting better and better!!
Keep up the good work!!