'Dating' helps people to get to know each other better, so that they can decide if they are compatible enough to get into a long-term relationships. If they realise that they aren't compatible, it's obviously better to NOT get into a relationship.
Dating is fun. Nothing wrong with dating for fun as long as both parties know the mind of the other. You are under 18, you can be thinking about a long term relationship but you shouldn't plan to commit to one for a few years yet.