I had a cheesy 12"-wheeled solid-tired Murray or something like that as my training wheel bike. but I can't count that as a "bike" -only a BSO.

My first real bike was a Huffy 3-speed banana seat bike with nut-cruncher top-tube shifter between the dual top-tubes with Red/Orange/Yellow flames on the chain guard, fenders and the seat.

I fixed up the bike to give to a friend's kid in the 90's and it promptly got stolen 2 days later. I've never ever seen one like it and have failed in all attempts to find a picture of one online.