Haha, I'm a mix between you and your brother (also a middle child here, 2/4). I'm getting my uni degree 2 years early. Haven't found employment (except one job as a community college tutor). Don't have a car or license (my mom hounds on me about this). 4.0+ GPA in high school, but drastically dropped down to a 3.0 in university. While my bro is more like the exact opposite. He's getting his degree a half a year late, found employment at several places, has a car/license, lower than a 4.0gpa in high school. Still low gpa (~2.7) in uni.
Yea, my reason for not driving comes from a couple things. First is not having a car. My bro has his own that he won't let me use. And my parents for a long time didn't want me driving their vans. The second reason is due to busyness as well as a slight phobia of driving. But I've started along the path, hating every second :P.
Man, I can't even fathom that. When I was a kid, I wanted nothing more than a driver's licence. To me, the ability to control where I was going on my own terms was a proxy for freedom, something I think many kids lack to a great extent. For my 16th birthday, my father split the cost of a 1983 RX-7 with me ($900 in 1998!), which was the happiest day of my life to date. The down side of having a sports car at age 16 is that it took me less than three weeks to total it.