does anyone know what it is??

hey guys,  i don’t know if this is normal or not, but i kind of feel empty. don’t get me wrong at school i can laugh and act like the happiest person alive. but when i get home, something shifts. i don’t really know how to explain it. suddenly i just can’t feel happy anymore, and i start to feel really lonely. i don’t think i have depression, but at home it sometimes feels like i do. even my parents have started to notice. i overheard them arguing two nights ago about whether they should put me in therapy. if anyone knows if this has a name or if it’s just something normal, please tell me.