You can do lots of different things. I started out racing BMX long ago, moved to road racing, and then to mountain bike racing. While I was not very good at any of them, I enjoyed the competition and had fun.

Now I enjoy using my bike as transportation. My 28 mile RT commute keeps me in shape while getting me to work, so I don't have to spend extra time at a gym. I'm thinking of trying out the randonne scene.

Try different things--you don't have to choose one and ignore the others. Have fun!