Don't calculate your losses yet unless you have sold some of your bitcoins. What you are feeling there is part of dca'ing or rather part of investing, though that was normal because crypto investments are volatile but there is still a chance that their value can recover.
Calculating losses will create panic, falling prices only make the estimated value of assets decrease, basically the number of assets remains the same. A real loss after selling bitcoin at a lower price, but investors don't need to sell it as long as it can survive. Losing some of the money owned is not an investment goal, even in the most critical conditions investors must be able to survive, because storms will not always occur. Investors must believe in the quality of Bitcoin, when the price goes down, its value will rise soon.