Work / What is life like in Poland for a student? [26]

Since I know that I have Polish roots, I got very interested in Poland and thought about living and working there. I am also learning the language and inform myself about the culture, so that as soon as I finished my school I can move to Poland and go study there.

But there's one thing that has always kind of irked me, or that made me kind of skeptical:
Why do so many Poles leave Poland? Why do so many Poles study and work abroad? What is it about Poland that makes so many young people leave? I've never been there, so I don't really have an own impression. However,when I notice how many people leave Poland, I ask myself wether I really want to move there. What is it like living there, how much does an own flat cost, how is the quality of life? In fact I can't even think of many more question, I just want to know -anything- regarding life in Poland. What is different to other places, and is it a good idea to go study there, etc?

Hopefully everyone will understand what I am onto. ^^ Any info is good.

Thanks