I honestly can't be sure what my first boat was. As far as a power boat, I had a Lafitte Skiff for running crab traps in '73. That was a first. Prior to that I had a homeade rowboat, several pirogues made of plywood, etc...
Some years ago, I had an old Sears aluminum "semi-vee", if that is what it's called. Had a Mercury 9.9hp and a Min Kota trolling motor. I sold it for a song cause I wasn't using it and I have regretted it many times since.