The same is true for me. Damn typing classes would mark you down if you didn't two space, so that drove me into two spacing everything, as well. I've been trying to push myself into single spacing for a while now, though...It's tough.
The program we used for "keyboarding" class required two spaces, too. (This was in 1998, but the program looked like something from the '80s.) The teacher had me evaluate a newer program (that looked more "Windows 95-ish") later in the year and it required a single space. I made a lot of typos that day.
I can't remember what my college course required because I only had to go five or six times to prove my proficiency. (Yes, my university's computing program required a typing course because they had students that couldn't touch type.)
In 1994 my typing class was still using Apple II's. I didn't appreciate it at the time, but I find it quite impressive that I was using the same computers in my senior high school class as my 1984 1st grade computer class.
