How to gain healthy weight?

so I'm 19, 5'6 and 105 pounds :(. just over a month ago I was 118! I'm trying to gain weight, but I'm never hungry. I tried adding on ensure drinks throughout the day. It's really depressing cause taking a shower or getting dressed makes me cry almost every time lol. I can see that I look gross. my ribs, spin and hip bone sticks out! I feel weak like I could break in half or something. I really want to gain weight! but in a healthy way, I don't want to just eat mcdonalds and be a skinny chick with a fat a**. what's the best way to gain healthy weight?!? than you!
How to gain healthy weight?
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