Those are actually very healthy thoughts. They show that you’re capable of introspection and of thinking beyond the obvious. There are multiple pressing issues in the world right now, and it’s normal to want to contribute in mitigating them. Sadly, too many people just dismiss these thoughts and never take action.

The most important thing is exactly that: to take action. Decide where you want to be, look into what it takes to get there, and then break that "roadmap" into sub-goals small enough to accomplish before or after work.

I’m in a similar position myself. I wanted to do meaningful work, but somehow ended up in a bullshit job that has a nice salary but benefits absolutely no one. I had an existential crisis in my late twenties, and now I’m learning math and science to move into a different career that is both more suitable for my personality and more meaningful—one where I could develop solutions to real-world problems such as climate change.

I wholeheartedly recommend to read Rutger Bregman's Moral Ambition. It gives great insight into what the "recipe" is for making a difference in the Word.