How can I get myself to eat more and gain weight?

I'm 19 years old, 5'4 and 110 lbs. I've been trying to gain weight for years, and it's possible but I have a very fast metabolism and I have to seriously overeat to make myself gain even 5 pounds. Then I lose it within 2 days if I stop stuffing my face. It's really frustrating because I want to gain weight so badly but I never feel hungry. Eating is like a chore to me. Sometimes I feel hungry but usually I have to consciously make myself eat more than once a day. I don't know what's wrong with me!! I just want to gain weight and have normal womanly curves instead of this bony body, but eating a lot just doesn't feel right to me.