I feel happy when the scale shows I'm underweight.
Do you think it's healthy to be underweight?
Yes, I'm supporting the idea of being underweight.
Being underweight is not healthy, you should eat more healthy food to gain weight. Consult a Dietician to learn what the best foods are to eat and maintain proper health and nutrition or you could be become unhealthy.
I'm not going to listen to any of your advice.
I understand the urge to be underweight since you are skinny. However, being underweight is extremely dangerous for your health, just like being overweight is. Talk to a doctor so you can get proper nutrition and return to a healthy weight.