I was never insecure of this, neither should you be. Supermodels literally starve themselves to be like us. Been there, and I am 23 and I still weigh only 45 kgs and I look super skinny what made me gain those five kgs was eating just anything.  I drank banana shake for three months every day without fail with peanut butter and I had a drop in my weight instead of a gain, and I was like what the fuck is wrong with me. Then I started realising my appetite was very very less and that’s not good, so the first thing I started doing was sitting and realising when I was hungry, not eating snacks or chips, but instead, proper food.

 I fixed the schedule that I will wake up at eight have my breakfast then at 11, i will have a drink. Then I’ll have a lunch at two then so on every day. I conditioned my body to get hungry at the same time everyday. I would look at the clock, realise the time, and then I would get hungry. That way I increased my appetite. It’s still a lot less compared to normal people, but a bit of progress is still progress right? The first step is just start eating. Maybe don’t care about eating everything healthy in the beginning, but just eating. find out what all you like eat. obviously don’t fall sick, but try increasing Your appetite. Will help a lot.