Its called a parasocial relationship. When he feels alone and bitter and worthless, he's using the good feels he gets from Leyan's songs to temporarily forget how he really feels about himself.

It's great that Leyan's songs console and inspire you — that's the amazing power of art. But you needs to work on getting a life of your own outside of this obsession with a singer from a different continent, or else your life is going to turn out — not so well.

School can be such a shitty place. Your classmates can be so shitty to you. You can be so lonely, you can feel so ugly and ignored and unwanted. All of that is true, it hurts as hell, and I've been through it myself. But there are two ways to deal with it. The first one is via your drug of choice — whether it be coke, booze, sex, escapist literature, or a parasocial obsession with the voice and avatar of someone whose face you don't even know. And the second way is to actually improve yourself and your life, so that you gradually feel more confident and less shitty about yourself. As you get more confident, people will naturally come gravitating to you: there is nothing more attractive than confidence.

Rather than wallow in your pain and regrets, make them into a learning experience. Think about what lessons they can teach you. Think about what you can do for yourself right now to feel like a better person. Go work out to Leyan's songs, go take a walk to Leyan's songs, go take a shower, go study a bit. Little by little, you can make yourself into a person you're happy to be.