It is important to realize that this individual with whom you are obsessed is someone you do not know. Individuals act differently in public than they do in private. Everyone has a public persona and a private persona. The image of the female musician is a public persona. Her image has been carefully crafted by her publicist and manager. It is not real. You are obsessed with and in love with an individual who is, in essence, imaginary. It is immature to be in love with someone you do not know.
Obsessions are always unhealthy. Being obsessed often means that an individual has become fixated on an individual or an object in an unhealthy way. Obsessions are usually accompanied by a great deal of distress. In this case, your obsession has led to depression and for that reason I would highly recommend counseling. It’s important for you to see reality clearly. Therapy could address your depression and assist you in becoming more realistic in your thinking. Don’t allow this obsession to continue. Realize that if it continues to lead to feelings of depression, then it requires professional help. Please take care.