If you haven't sold, then you haven't loss anything. Stop comparing the highest price to what the price is now. You didn't sell at the top so it was never "your" money. Until the money is in your hands, it was never yours. Just comparing the highs to the lows will make you go crazy.
I agree! This principle works out fine for me every single time. Just be confident that nobody really losses anything until they sell their coins lower price relative to buy it. Don't go looking at low and the highs most of the time of the day, you'll end up with a heart attack.
Also before investing it is best that you understood how this platform or market behaves.