Hard to gain weight

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In 2016 I only weigh 59kg or 130lbs for 5’8” tall and 62kg last year. I always eat a lot like a normal person can eat or eat too much most of the time. 3 months ago I weigh 68kg and thats the heaviest Ive ever weigh and I still look skinny, I decided to go to the gym and take suppliment for mass gain. After 3 months I only gain 2kg., I am now at 70 kg and my actual target is to reach the 75kg. Its too slow for 3 months of eathing and going to gym. Im instructor is having full time on me everytime im at the gym. One thing we notice is I sweat a lot, He even excluded the cardio in my program and do more of stretching instead before the work out. But I decide not to give up. I decided that even of its hard and not seen so much result from it. The important things is there is a progress.