Everybody pays tax, or better put, everybody should pay tax, it doesn't matter if you're poor or rich, as far as you earn an income and have assets you should pay tax. Tax is just usually higher for higher income earner in most countries.
The problem is government officials and politicians are too greedy enriching themselves than building better places for it's citizens, especially in developing countries where there is no proper system. So if you live in that type of country you have to realize that you're in your own. People in developed countries with a working system don't have it easy but it's worse in a place without a system.
As much as countries are filled with corrupt systems, you still have to obey the laws or you'll be punished, so you have to pay your taxes.
Unless for third world countries where the revenue generation and tax paying system is not as strong and effective as possible, making it possible for the lower class citizens of those countries not to pay tax because the popular opinion from the poor people is that paying of taxes by them is seen as extortion from the side of the government.
Due to this popular notion attached to the taxes collected by the government, it becomes difficult for the government agents to effectively collect those taxes making it more popular that only the rich people are the true taxpayers of the government. When we say rich people, in this context it also means those with thriving businesses and so on.
Since, in those kinds of countries, the class of people are differentiated by their environments which means the rich people oftentimes live in expensive and well coordinated environments like estates in big cities etc, making it easy to collect taxes from them. whereas the poor people live in a slums where houses are not properly built and people are always resistant to government enforcements.