You only lose when you sell for less than you paid.
Nobody has ever lost money by holding.
It is incredible how many people on this forum have convinced themselves that this is the case.
Fundamentally, the value of the assets we hold is the amount of utility they can provide, in terms of consumption goods.
Consumer price inflation measures the buying power of fiat.
The current BTC/USD price, adjusted for consumer price inflation (which is tiny compared to BTC/USD volatility), tells you the buying power of BTC.
That buying power has crashed.
You definitely have made a loss, even if you haven't actually sold.