recently i noticed a young polish girl that looks my age (18) but every time for strange reason we look at each other and look away. is it we like each other or what?
Could be. Or she could think you might be stalking her. You never know really.
Just try to talk to her, get to know her, and see how it goes :)
Ask questions about her home town in Poland, we usually love talking about them, since there is no place like home. Keep a smile on your face the entire time she talks about it, and if she goes into detail about it, say you'd like to visit there some time because it sounds nice.
Tell her you'd always wanted to learn more about Poland, whether you want to or not, and ask about certain cities.
Warsaw (as basic as it gets)
Stufy up on Poland, learn about famous Poles, and never be afraid to ask about her home and what she liked to do. We Poles seem to love to talk about the mountain springs and the great monuments in Poland :)
Hope I helped :)