I do try to plan out an outline, at least for a overarching plot.
That being said, it's the magic of maybe just doodling a scene kinda charms me into seeing if I can incorporate those silly/exciting developments in. Planning every detail in a narrative makes me a little obsessive, and my perfectionist side tends to suck up all the fun, until I make the realization that I've been planning more than doing anything substantial.
Still, I'm pretty much like you.
If I were to start a weekly autobiographical comic, I wouldn't plan for an end, but of course there would be someday.
Dark joke aside, love your art. Can't wait to read the backlog.