Assuming that you are in fact human? With human needs, emotions, and desires? To your question? Having a crush on __(anybody in particular)____ normal? Remove Youtube star with ... anybody. Does that answer your question?
Simple answer? Yes. Having emotional attractions to other humans is normal. Obsessing over individuals you will likely never meet? That's when things turn unhealthy if allowed to grow into emotionally tumorous proportions. Letting this hypothetical emotional attachment prevent you from interacting with humans (peers in your immediate vicinity)? That's not healthy or normal.
It's healthy to feel emotions towards persons you feel attracted towards (emotionally and physically). Placing these persons on a mile high pedestal however is detrimental towards the target of your affection as well as your own sense of self.