However,when I notice how many people leave Poland, I ask myself wether I really want to move there.
Smart kid. The reason so many people leave Poland is that it is easier to find a job abroad than in Poland. Also, Polish universities are generally not as good as their American or Western European counterparts. Poland is still a poor country compared to American and Western Europe, and life is more difficult. It would not be a good idea to study in Poland.
Having said that, I am an American with Polish roots who has been living in Poland for eleven years. Because I am a highly trained scientist, I've been able to make a decent living as a scientific translator here. Nothing like the money I earned working in the hospital in the States, but enough to get by, and without the stress. Fortunately, I don't have a family to support. If I did, I would not be living in Poland. I live in Wrocław, which is the nicest city in Poland.
Keep studying Polish, study at a good university in your country. And then when you are financially secure and self-sufficient, and have qualifications and experience that you can sell, move to Poland for a while and try it out.