I just bought 0.01 ltc mini and instantly lost 5 euro anybody knows what caused this
Its called "spread"! You are trading using Contract for Difference (CFDs) and not actually buying real coin. Even if you were buying the actual coin, their would still be a spread involved.
Before trading, you should first learn the basic concepts and mechanisms of trading. In the same way that a doctor, engineer, architect, carpenter, tennis player need to first learn their trade or skill for many years before they can put it into practice.