I think that, as an adult, wishing that you are something that you are not is a thought that is not worthy of respect.
I think that having aspirations to learn a new trade, or become a better person are constructive.
While wishing for the unobtainable such as being an endomorph instead of an ectomorph, or being a female instead of a male,
or having super powers, or having a relationship with a fictional character, is actually destructive.