Unless you're ~12 years old, living with your parents, and all your money is a total of $100. I'd say exactly what jonathan said. Bitcoin is volatile, and most of the world still operates on standard fiat currency.
is it risky to turn all my money to bitcoins? anyhow this money sits in the bank and do nothing for!
Yes, it's risky to turn all your money into bitcoin. Bitcoin is volatile and if you know what you are entering you understand the risk that you'll be taking. And if your money is just staying in the bank and earning with a very low interest better to take the risk in bitcoin by buying at dip and wait for it to grow. The profit in bitcoin may grow in lesser time than your expectation. More risk, more profit but invest only what you afford to lose.