D+D in middle school and onward, though my favorite tabletop is (and probably always will be) Mage: The Ascension. I already had plenty of experience imagining "what would I do in this situation" from various forms of media and writing my own stories.
I have a column/blog written from an IC perspective, be warned, it's probably a little bit too vulgar for RPC - https://graff-lacroix.tumblr.com/