Why do Japanese mix up "L" and "R"?

Download videos:

I also can't roll my R's. It is physically impossible STOP TRYING TO TEACH ME HOW.Read some helpful stuff about Japan: Life has no limits! Get out there and do something new today!*・゜゚・*:.。..。.:*・'ヽ(*^▽^*)ノ'・*:.。. .。.:*・゜゚・*

Japan Japanese challenge game japanese people jun l and r language mix up rac... rachel say why why can't why do japanese mix up l and r yt:cc=on