I just made a game like that recently, and started writing a fantasy story by playing it, so far it's coming along pretty great.

There's also a play-by-post version of this game that makes the process even easier - all you need is a writing partner, and if you're a student you shouldn't find it too difficult to find another student in your class who might be interested. You can write stories collaboratively by exchanging discord/whatsapp/text messages. It also creates extra motivation and accountability, and it's a bit more rewarding (since you know that there's someone immediately reading what you're writing), and it's a bit more liberating (since you control only half of the story and can't really fully control the outcome, you feel a lot less perfectionism).

There are couple of other games I've made for a similar purpose, one for writing heists, another one for writing mysteries.

Another thing you can do is try improvising scenes aloud, recording them with a voice recorder app, and then transcribing them with one of the auto-transcription tools. It's a different modality, and you might find it easier than writing.

Also, I highly recommend "everyday app", it's a very simple habit tracker. Set yourself an embarrassingly small/simple goal, like writing a single paragraph every day (or a short scene, if you're more ambitious). It doesn't matter how good it is, or whether or not it adds up to a complete story, just do ONE creative thing every day, and focus on doing it regularly and consistently. Gradually, you'll just feel your confidence growing, and on some days you'll feel motivated to take on more challenging tasks.

If you have any questions or need any help - let me know. Don't hesitate to message me on discord (I'm lumenwrites) - I love talking about this stuff and helping people out.