You're not really losing. Paper loss is not a loss in the sense that your Bitcoin is intact and that it's only the price that has decreased. And it's normal for a highly unpredictable and volatile asset like Bitcoin. Well, it's strictly an unrealized loss, but that doesn't mean anything unless you will sell your Bitcoin. The only thing that would make you lose is if you sell at a loss. So if there will come a time when you want to sell, do it with a realized gain than loss.

To be honest, if you're new it could indeed be stressful. If the price value of your Bitcoin portfolio has fallen 70%, you could possibly get stressed. But that's the tendency only if you focus on its short-term to medium-term price fluctuations. If you zoom out the entire Bitcoin chart, you will see how things will eventually get better in the end.