Out of the gate the language you learn is unimportant. You want to understand the basic fundamentals because they're applicable across the board and make learning any new language a trivial affair. Basically just pick the one which interests you the most, search for some tutorials and material either online or through books, and run with it. For example all my work right now is some unholy concoction of JS, PHP, and Go, but I originally learned coding through C++ and making simple games with the SFML library. For juniors most of the time you're going to be hired based upon your general skills rather than knowledge of a specific language.
Going to second
@Deluxe too, don't go for video games unless you live and breathe vidya because the industry feeds on the young and impressionable. There's lots of less glamorous tech jobs out there which both pay more and have much better work-life balance.