I do not think that trying to be like someone else is a waste of time. Everyone is their own person and should want to be themselves. But to want to be like someone else is not a wasted effort. Because if that person is someone that you look up to it could be as simple as to wanting to better yourself as a person or better yourself at something. So i look at it as the point as long as you do not want to change yourself in general, but to better yourself in anyway possible nothing is never wasted.