IF you want to educate yourself before making claims about currency I advise you to read here:
https://www.investopedia.com/terms/c/currency.aspCurrency is a medium of exchange for goods and services.
Meaning there is no benefit in a currency before you exchange it meaning you get new people in the system.
A key characteristic of modern money is that it is uniformly worthless in itself.
It is the same for Bitcoin, Dollar, Euro etc.
The exchange rate is the current value of any currency in exchange for another currency.
Meaning the value of bitcoin is quite high even if you do not believe it. The value is derived from the amount of people that want to enter the system.