Can i request a Loan 0.02BTC ?
will pay on or before January 5
Repay 0.022BTC
This is my address: 3KDESoq8DjwE7PXEpYXiD3G34rhzBdKswV
You didn't specified the reason (well, this may be optional) nor the collateral. If there is no collateral there won't have a loan !
Can my account enough to be a collateral?
Yes, it can, as stated in the OP. So, do you want to use it as collateral ? What's the reason for this loan (you can choose to don't reply) ?