I am the. I've been using Steam and playing Valve games since 2020, but I've known some of them, especially Garry's Mod, since around 2014. God, I wish I installed Steam back then.
Greeting Ssss, i'm a huge Half Life fan and all valve games. My favorite Half Life games are Opposing Force and Black Mesa, even though Half-Life 1 was one of my first played video games ever.