Get your own wallet to store your bitcoin. Something that allows you to maintain control of your private keys. It is much safer.
Suggestions:
Armory
Bitcoin-Qt
Electrum, MultiBit,
https://blockchain.info/walletThe suggestions are listed in order from most inconvenient to use to most convenient.
The suggestions are also listed in order from most secure to least secure (the differences in security between Electrum, MultiBit, and blockchain.info are negligible)