Is it possible to withdraw bitcoins to bank account
Depend on what country you live on, if you are US resident you can use coinbase exchange service, coinbase exchange service only available for US. In my country a couple exchange provide withdrawal to bank account, and this service very helpful for me,because I don't need to worry get scam with another people.
you can use exchange services such as cex.io or btc-e or any other. maybe you can find local bitcoin exchange services depends on your location.