I am not saying bitcoin is the same as money, just that they are both fiat currency. I am not saying gold has a value, just that one dollar represents one gold pound, or something else if it wasn't a fiat currency. A bitcoin doesn't represent one dollar or one piece of bread or anything, instead it is a fiat currency dictated by supply and demand for that currency.

Take a look at a snippet from Investopedia:
The value of fiat money is derived from the relationship between supply and demand rather than the value of the material that the money is made of. Historically, most currencies were based on physical commodities such as gold or silver, but fiat money is based solely on faith. Fiat is the Latin word for "it shall be".