My 19 year old steam account (started somewhere in september 2003) says it has 6 games. But of those 6 I've only bought 2 (the rest are freebies or spinoffs that started as mods). Also Half-Life is missing in the list so it should be 7 games
Of the two games that are listed I can only play 1 since nowadays I'm a Mac user that game is Civ VI since they where slow to release it on the Mac Appstore.
Back in the day steam really sucked and I only got it to be able to play CS and DoD. Then a while later a game I was involved in the development with (that I will not disclose) released on steam so that was the second game I got on steam. Civ VI I got around release (of the Mac port).
When I was a PC gamer I rather got games outside of steam and then my time and will to play most PC games tapered off. Nowadays (since I'm a mac user) if there is a game that I can play on mac I first and foremost look in the Mac App store before going to steam. Thus my puny steam library during these 19 years.