Anyone trying to gain weight/muscle?

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I've noticed there's not too many people using MFP to GAIN weight. I'm a skinny guy about 5' 10" and a half and 150 lbs. It would be nice to maintain a weight of at least 170 lbs and I think MFP will significantly help out. I've been battling my metabolism my whole life. No matter how much I eat, I don't gain a single pound. Now trying some new diets to help gain weight. Another one of my goals is to make sure I gain muscle, and not fat. I'm also doing some P90X and Muay Thai as well. Anyone similar to myself feel free to hit me up for different perspectives and ideas. And if you not, hit me up anyways. I can talk health and fitness all day.