I am a man in my late 20s. I am extremely thin, but
 
since I was young, I have had severe facial asymmetry and my body shape is distorted, to
 
the point where I have a forward head posture. Because of this, my face has been greatly affected, and my current weight and appearance are terrible. When I visited the hospital, the amount of fat, or flesh, around my chin was average, but it felt like it was sagging a lot. I think I have a lot of it.
 
It was originally worse, but I often use a mewing device? It has been reduced a lot to this extent. They said that sagging jawline due to a forward head posture cannot be corrected
 
even with mewing. Since I can't straighten my face when I go out, my forward head posture is getting worse and I feel like I'm losing my confidence.
 
Please give me some advice or experience.