How would one fight against the current slide towards fascism?

I want to do something. Anything. This isn't fair. I didn't vote in the election. I couldn't. I'm not old enough. I didn't choose this and now it feels like my world is falling apart. I want to stop engaging with politics entirely. But I know that's irresponsible. Just burying my head in the sand before the inevitable. I want to do something. I want to act. But what do I have the power to do?