I have read about offline wallet but i am not comfortable for doing that, its too scary for me.
I would probably go for a direct bank withdrawal.
Print out a paper wallet and keep it in your wallet. You should feel a bit more comfortable about that. Just don't store massive amounts on your online wallet.
yeah never stored big amount in wallet online , people will try to guessing hacking etc to get claim your adress
That's not the problem. Anyone can do that with sufficient malware installed on the victims computer. The biggest and the most troubling problem is the reliability of the company that's keeping your private keys. They could pack up and go whenever they want to.
yeah as we know online wallet hold our private key , but if the online wallet like big company blockchain i think they will never run only for 100 bitcoin , is not worth.
With it's current price it's not worth it. But there are another couple hundred thousand people who use their service, they are holding a large sum of money. Although they seem reputable, you can't put your trust in an anonymous irreversible currency. They can still run off with it. You did mention the possibility of being hacked. That is severe. Look at inputs.io
prejudice is okay , but over prejudice is not good. just more take careful when you have a lot of bitcoin and its stored online and you know that priv key are hold by company it means they have access to your wallet to move as they want .