I started on a random c3 server - it was a low rate one; but not for too long anyway. My internet cafe and I quickly moved to c4. I remember l2pvpx, l2dex, l2max, l2brazuca, l2forever; too many to remember. L2Gold was probably the first custom server I tried, back when having a weapon with SA and Noblesse was the big thing. After that, I think L2AePvP (rechristened L2Pride) became a big thing in our internet cafe. Even though most of us had a computer and internet at home - 100mbps fiber (in the building) in early 2000, in our city.
I regret not playing WoW. Only a few nerds played this game when I was a little kid.
I was playing a lot of DotA and other custom maps on Warcraft 3 - mostly on Garena.
CS 1.6 was a game I dominated the most in terms of performance; late elementary school/early high school.
I rarely play L2 and CS:GO these days.
Mostly DotA 2 - my biggest performance was probably in 2016 or so. Now I'm a noob. Mostly playing occasionally with other noobish friends.
So all my life I've been a Counter Strike, DotA, Lineage 2 player.
I tried other games, but not for too long, I got bored very quickly.
I guess competitive gaming is for me. But as you get older, you don't have the same reflexes or time for it. The change will be made sooner or later.