Sounds like we're about the same age. I did #2 and #3 and was science inclined, etc... But, I also did sports and was outdoorsy. A single TV in my house meant no computer time if my dad was home, so I had to do other things.

I started undergrad as pre-med, and programming was just a fun hobby. I remember one night while studying for some insane biology test from an equally insane teacher that while I was interested in being a doctor, I loved programming/computers/technology. I pushed through that semester and switched majors.

Even today, I feel not nerdy enough in some situations though my wife would disagree (she thinks I'm very nerdy).