I wouldn't want to be anyone else than me. If I were someone else I would lose knowledge of what some people go through, I would forget so many things... by being someone else, some of the traits important to you might be lost. For example, you could have been stubbornly perseverant- willing to pull through bad situations, but by being another person, you might not go through the same situations that would give you a will as strong as that.

Being another person would be to forget myself and lose my identity- which frankly is not that appealing despite the fact that life might be easier as someone else.