Same here. Sounds strange as it's 'just' a game but Doom helped define who I am. Whether that's a good thing or a bad thing? I really don't know.
I remember I first played Doom 2 back in '95 when I was around 6 and I've literally been hooked since day one. I own it on various consoles, have the novels, posters, etc. I'm influenced in my art and music by Doom. Even when new games came out like Duke Nukem, Quake, Half Life and Halo, as great as they are they can't compare to Doom!