You are far from the only one in that position. My youngest son hardly ever comes out of his room either and it is very common. (In Japan there is a name for it Hukamori or something similiar.) No one else can make him or you feel better. You need to decide to take the next step towards getting better by doing something that will help. Let in more light, eat vegetables and fruit, go for a walk, don't let your thoughts carry you in circles, meditate, do something for someone, put a pencil in your mouth to simulate smiling, sing, do that shaking thing, start learning a language... there are always small steps to take to feel better. Setting out is always the hardest. Humans were made to walk, take one step after another and you will feel better.
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Maybe if I learn enough languages I will understand humans one day.