Now If you compare yourself- with someone who lives in bad countries goverment are corrupted violance no resources and daily life is huge struggle, and you live in let's say in eu usa or any other democratic western society and you feel like you struggling and you poor, then someone else who don't even live in this country where you will that he or she will be happy If they would be you with your problems and opportunities.
If you see anyone who got way harder struggles than you have then it's because they are strong enough to carry them but If those struggles will come to you then it will be too hard for you to deal with them because If you complain about your much easy life and struggles.
So what about the lives of people who are in those countries and they have no chance of getting out in a life full of corrupt government, violence and no resources that could lead them to a much better life. There is almost no choice for people there because they have to endure the bad life that they live in and out there people easily think of getting out of economic hardship. Nobody expects this kind of life and if there is an opportunity they will definitely leave that place to find a much better life.
But it's all complicated for them and there may be no chance that they can get a better life. Poor countries are usually prone to corruption in government, violence and a life without good social control and this is influenced by people's difficulties in reaching a better stage of life in making money.