Loss is a part of any business and in forex loss also comes to trader's trading.When a trader falls into a new situation and doesn't know perfectly what to do,he becomes confused if he's low in experience.Then he makes mistake and faces loss.But the positive thing of this loss is he can find which point he made mistake and then solve it.Thus he will not fall in loss for the same reason next time.

Impossible, every business has a risk.

It's can be both possible or impossible, you should know that every business has a risk.