I used to write a lot when I was younger, but this was always painful. My friend and family would go "meh" when reading what I wrote (they're not avid readers themselves), other writers would "love it", then want to change everything, and I started to second guess everything I was writing, to the point I didn't love it anymore and procrastinated more and more until I had to admit to myself I just stopped writing.
And then, a few years ago, I started playing dungeons and dragons, in play by post games. It was fun, and I did enjoy writing again, even if it was casual writing.
Then it hit me : why not play solo and go a bit further? I started playing alone, doing both the game master and the players, all written (while still continuing other games with people, of course). And this was _incredibly_ fun. It was the same feeling that I had when I started writing younger, but with no obstacles anymore. Plus, because of the dice rolls, even I was not sure what would happen next. I take weeks to create characters with detailed personalities and backstory, I drop them in the story, and I discover them, because it's only when they face a given situation or talk with a given character that it becomes obvious how they will react.
I would recommend that to anyone who loves writing. There's nobody to tell you it's too short, or it's too long, or this section is not detailed enough, or this one is boringly full of details. If you write only for yourself, you can focus on the best things in writing : imagination, and having fun.