if I've created account/wallet on coinbase or any other exchange then my account is hacked and my coins/money lost who are responsible for it
The Exchange where I've created account

is it my mistake

what's you thought about it

and how i make my account safe

absolutely you, after making an account especially in exchanger make sure to enable your 2fa and other security etc and also bookmark the website of exchangers to avoid fishing sites, you are responsible for your security be carefull all the time.