For me, gurps 3rd edition basic set before the revision when it still had an adventure module and strands of fate 2nd edition would be my picks. Both generic, and I think strands explains the concepts of fate better than the actual fate core book does. It's got issues with aspect bloat, but...
I was lucky. I grew up with very religious parents, but they were also open minded. My father was a wargamer of the old hex and counter style and got me into gaming. I was always interested in d&d, watched the cartoon a bit, when my parents weren't up yet on Saturday mornings, though...
Huh... I have these disks, but when i tried to install them on my windows 10 system they just... don't. I've tried all the various compatibility modes and whatnot, but it just refuses to actually install. :P