In fact, no one can forecast the future of a cryptocurrency with any accuracy, if we could, we'd all be billionaires. Prices for cryptocurrencies are quite variable. This implies that the value of a coin might fluctuate dramatically and for no apparent cause. Price prediction is significantly more difficult in this environment than in regular markets.
You're right, no one can make accurate calls. In trading or investing, emotions shouldn't enter the picture. As long as I know the time for profit is coming, dips like these don't make me angry or sad. Bitcoin will make you money regardless of how much dip it takes. Results are based on technical and fundamental factors. It would be amazing if that one does better!