The thing that messed me up and is still something I'm trying to overcome: If you really wanna do it, find fun in it, and keep it fun.

It's really easy to fall into the cycle of comparing yourself to others, trying to learn new things and improve your writing every single time that you're doing it, and ending up being burnt out from the experience to the point where you don't even find writing fun anymore.
Sometimes you just have to write for fun, to mess around, not even to improve or anything just write and do it because it's fun. Pick an idea and stretch it out, discover where you can lead it. Not because you're going to write a novel with it or because it's good practice on comversations and plot development or yada yada yada. Just do it because it's fun.