All traders have a miserable experience in their trading, because it is not always possible to make the profits that we expect. Sometimes for years someone can get a strategy or manage their emotions. So indeed in trading and investing it takes patience to profit. There's no need to be sad, I've lost a lot, but it's a lesson not to take it anymore.
I'm sure professional traders are also experiencing hardship when they are starting to trade, sometime managing emotion is also very hard and can cause mistake in trading like selling when later the coin is going up that will make us really regret and in trading we dont really have clear perception what the price will become in the future.
But if we stress about these trading losses it can cause us become very stressed and not healthy.Its better to focus on the future on becoming a better trader rather than just stressing the past trading mistakes.