Yes, you're right. On the one hand, real trading and demo-trading are two different things. Real trading involves a lot of emotions, while demo trading is more like a game than real business.
Still, demo trading is a very important thing, especially if you have never traded. In general, I can compare trading with checkers. You don't have much time to think, so you have to make quick decisions. This can only be achieved with practice, when you study trading patterns and learn to react instantly.
A demo account allows you to learn how to trade and recognize trading patterns, so I think it's very important.