Yes, this question falls under Philosophy. It is a form of relying on others for your own sense of self-worth, of comparing yourself to others to determine what is good and what is bad. Person X wants a car, say a BMW, not because it is good, by some objective standard he has identified, but because it is better than his neighbor's car (how does he know it is better? Someone else, possibly his neighbor, told him so). This type of person does not care about BMWs or any form of objective good, only about his relationship to other people. He would be perfectly happy to live in a mud hut surrounded by pigs, so long as his neighbor slept in a ditch. If his friends are petty thieves, the good, to him, would be to become a bank robber. If his friends torture and kill animals, he will become a serial killer.
To place your concern, not with reality as it is, but with other people's perception of it, is social subjectivism. To place your concern, not with reality as it is, but with reality as you wish it was, is personal subjectivism. To set your mind to the task of identifying facts in reality, is to be objective.
