Can't eat much help! please

For the longest time I weighed at 105. I have a high metabolism. Most likely you do as well. But I went to the gym, learned key exercises for muscle growth in general. Squats, heavy lifting with few reps will help you out the most. Make sure you have your intake of at most 40grams of protein per day, this can help you alongside healthy fats and carbs. I eat plain spaghetti on workout days. This is just small advice, I am still learning myself. One trick to gaining weight the right way is learning how to eat more and eat more of the right stuff. I stay away as much as I can from sugary snacks. Nuts are good though. It was tough at first building an appetite- I learned by having regular 3/4 big meals a day and snacking in between. I weigh 114 pounds as of now. Hope this helps somewhat.