Was your fast metabolism diagnosed by a doctor? If not and you are/ underweight I can say that there is a very likely that you have a slow metabolism. The more muscle you have the faster your metabolism. Since you already said you were underweight it's safe to say yours is slow since it is slow the food you eat gets pooped or peed out of your body before it can get converted to either fat or muscle. "Fat people" have a faster metabolism so the food they eat gets converted/ stored as muscle or fat instead of being pushed out of the body. Hence they are bigger then you. If your looking to gain more weight eat more carbs: rice, potatoes, bread, watermelon, things like that. If you still feel your eating a lot prove yourself wrong by weighing your food and counting your daily macronutrient intake vs your activity in relation to your resting metabolic rate and you will see that you are eating in a deficit.
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Wait a few years. Everyone's metabolism, no matter how fast it is, slows down a lot as they get older. Trust me, you won't have any trouble gaining weight once you start approaching 30.
If you don't feel like waiting, just start downing high-calorie, high-fat foods. Although I wouldn't recommend doing it for a long time.
I wouldn't try to gain weight if I were in your place because the metabolism slows down with age.
But if you want to gain weight there are two ways.
Healthy way: eat healthy and work out your muscles. This way you will gain muscles that weight more.
Unhealthy way: search "feederism" on tumblr. After a lot of pics with overweight and obese people you will find posts about how to gain weight (fat).
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There's no magial tip or any supplement that will make you gain weight instantly. Simply eat more. You might think that you eat a lot, but if you don't gain weight, you simply don't eat enough.
Crash weight gain powder but It turned me into a big guy when I was skinny
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