A teenager should never make an important decision alone .Do you

In my opinion, its completely fair for the teenagers to make the important decisions all by themselves. I think so for the three following reasons. First of all, a person has to learn by committing his or her own mistakes as its vital for self-realization. Secondly, its not right to guide the people and dont allow them making their own decisions. Finally, its apparent that everything is dependent on the nature of the decision itself, although its still better to avoid interfering into someone elses life.