Sometimes we are to scared to put investment and lose a big opportunity, sometimes we are too confidence and lose a big money. The second one is sometimes caused by this demo account.
Again, I didn't find a crypto or stock platform that give a demo account and intentionally let potential users to win more to attract them, but we need to be careful from the start.
For me you are not yet failure in trading as long as you didn't stop or quit yet, failing and losing some money is just normal in trading while you are studying it, you are earning and learning thru your experience at the same time, you have to bring a lot of patience, as trading is not instant, although you are sure of your chart reading, still the market is unpredictable and can be reverse anytime.