While the reason I game, as stated above, is pretty simple and dull, how I started gaming is a bit more involved, and hopefully interesting:
I have basically always been role-playing. Even as a little kid, when I was forced to pull my nose out of either a book, a video game, or a book about video games, and had to be around other children (basically only at school) there were no sports. No games, no stupid dares. There was making up characters and acting out stories. Really, really, really self-aggrandizing stories. In between, I wrote even more self-aggrandizing stories. It was all awful, but fun.
Once I moved up to middle school, there was no longer any motivation to bother with other kids, since I didn't have to find a way to pass my time in recess, due to lack of recess. Also middle school had a library. SCORE! But at home, I gained access to something new and glorious: The internet. And I discovered that all that same shit I'd been doing had a name: Role Playing. And people were doing it online. And it was awful, edgy, and usually an excuse to score some cyber. So basically it was everything I could have ever wanted.
Fast forward five years. I've been role-playing online the entire time. I've got a regular set of people I play with, I've met the person who would end up being my ex-wife among them, and I'm currently living with her. We're all having a grand old time getting our RP on, making fun of those weirdos in the other chat rooms with their dice bots "Roll Playing" like idiots, because they apparently can't resolve any kind of conflict without random arbitration. Pshaw and poppycock I say! Nonsense.
Buuuuuut... I was beginning to think otherwise. Because see, I love games. I love role-playing. Why not mix the two? Oh, sure, it's not necessary to have a random arbiter for role-playing (and I still believe that), but it could be fun. But everything I've seen is just so damn simple and boring. But maybe a tabletop game would be more interesting? Can't hurt to look, right? So while having these thoughts, I see the D&D 3.5 PHB on the shelf at a bookstore while buying comics and it immediately attracts my attention with its sheer size. I glance through it, then notice the DMG. Holy hell, this thing is so overcomplicated they couldn't fit it into one book? Fucking score! I picked that shit up along with the Monster Manual and studied them in a frenzy. Started setting up my first game.
... It was a dumpster fire. It was basically a big convoluted map with no real reason to exist or for anybody to care about it. Chock full of kobolds. My three players (future ex-wife, and my 9 and 10 year old siblings) start at three completely separate places and are expected to work their way to the middle to meet one another and get shit-stomped by the mass of enemies there. But that's okay! I have a character too! Of a custom-made class! That's right, I made a custom-made class for my own GMPC in a game I'd never run, having never run a game before! It was fucking stupid! Deus Ex Dumbass saves everybody and they all decide to go on adventures together!
... Adventures that never happened. Because I was lazy. And that was hard. And even though they all pestered me for months for more (of that garbage? really?) I never got around to running a second session. Kept role-playing online for about five more years, came upon a podcast about RPGs called Fear the Boot. It was fun! I liked it. Listened for a few years until their third Fear the Con ... and I decided to go. And actually played some good games. And from there the future ex-wife and started a gaming group with her GMing that ... was awful. But that led us to a good group, and the rest has been history.