That is a terrible idea for several reasons.

Bitcoin is extremely volatile, and this means that there is a wide spread, and any future price rise needs to cover this for both the buying and the selling.
The price of Bitcoin is being manipulated, and it may go down for a sustained period, or shoot up to provide quick profits. Buying Bitcoin is a long term investment in my opinion. Trading the coin is extremely risks.
13% is far too high a rate for a loan, you should be able to get one for 2-4%
You should never borrow money for high risk speculation such as Bitcoin.