Nobody on the planet has this issue but me?!

Anytime I start Gmod I get this error:

SteamStartup() failed: SteamStartup(0xf,0x0xbffff27c) failed with error 1: Timed out waiting for Engine to start

I was playing Gmod and I crashed. I go back to open it and this pops up every time. I reinstalled and the same thing happened. I really need help!

Completely uninstall GMod:

Right click on Garry’s Mod in your Steam Library and delete local content
Delete your garrysmod folder (located in steam\steamapps[yoursteamname]\garrysmod)

Restart Steam and reinstall Garry’s Mod.

Might want to back up your addons and stuff too.