I remember playing this on my crappy old PC, I was a little child, too. I would get so scared anytime one of those crazy flying heads would starts shooting me with the energy balls. Man, those were good times!

My first 3D game was.......are the Myst games considered 3D?

Wow, I thought that this would be one of the more obscure games on the site.  I was surprised to find people posting here already.  This was the first 3D game that I ever played also.  After this would be Wolfenstein 3D.

Termite:  Myst games were not being rendered in real-time, so I would not consider them "true 3D."