Well, if more people like you stopped saying "it's impossible" maybe some of your countrymen would stop thinking it was. Some might even start thinking about how to change it.
I've noticed many Americans seem to have a strange habit of dismissing or often completely ignoring (as you just did) anything that happens outside of the US. Clearly representative democracy must invariably result in two parties with an unshakeable grip on power! Except that most of the time it doesn't. Just in the USA.
Do what people in other places in the world have done. Get off your ass, stop saying it's impossible, and work for change. Go find a third party you can support and volunteer for them. Or run yourself. Sure you'll lose, today. Maybe not tomorrow.