>>717225608 (OP)
start with 2d,
fuck around and make simple "toys", not games till you get a handle on things
once you know all the rules and you're confident enough to break them, abandon the "Unity way" of doing things, i.e. monobehaviours everywhere, try to handle most/all of your logic and state in one place.
once you've made a small 2d project that resembles a game, try your hand at some gamejams, this will teach you how to start-to-finish release a game for people can play (this is the most important step)
NOW you can make stuff you actually wanna make.
good luck!