How to change the current reality and live in a decent place? I hate where I was born and there's no way to solve it...

its not about poverty, its about what kind of people populate your country. Eastern europe has been a poor shithole most of the time of its history but it was still good to live there. Why? Because they created a sense of community and trust. Trust creates security and cleanliness. No matter the amount of money or prosperity

Sounds like a plan.

I thought Bolsonaro just made it so that you guys can own guns?

Even India, a country that's way poorer than Brazil, has virtually no violence. It's about the culture, indeed.

How can people live like that? What are they waiting for? Why are they so lazy and useless? The serfs from medieval times had more self-respect and better communities than these shits.

To be honest, I was expecting more relevant changes. He only changed a few bureaucracies, but most of the regulations still stand. Maybe he will improve the current system in the future, but I don't want to get my hopes up.

indians are violent too, look what they do to their women but i get your point
are you white?

what the fuck is wrong with those faggots? You don't need much money to buy some gardening/farming-like tools and clean up that shit in a couple of days

It's a complex issue, but I'd bet it is a mix of:
- A disregard for community; they don't care about littering or shitting the place, as long as it isn't inside their homes (which sometimes is);
- Everything they see on TV is people who got rich without working hard (rappers, youtubers, actors), so in their mindset working is "dumb" and any effort is worthless;
- Schools fucking suck, so they don't learn basic things like economy or critical thinking;
I'm by no means an expert on these issues, but I know there's no way to solve this in a single generation. It will take at least 200 years to see any improvement.

Why do Brazilians have no concept of cleanless? Why do our cities are so dirty and full of trash?
*I know there are exceptions, but even in the South the favelas are exactly like OP, dirty*