If your goal is to be "that" guy... The one that software engineers fear and gossip about when you arrive at the office, you'll want to go with C to start. You'll also want to learn x86/64 Assembly and LOAD your C applications up with unnecessary functions written in Assembly for the purpose of speed. When you create your GitHub account, you'll want to create things in Lisp, Cobol, and Fortran (mention that its for fun). You'll want to post random rants on your twitter about how C++ is TRASH, treating it like a disease that needs to be eradicated.
Go and C# are fun and pretty cool too. At some point you'll realize its ALL bullshit and doesn't even matter any more what you're using.