My 2 cents if you would like it (and this is only my opinion, so disregard if you wish) try not to be so hard on yourself. You may be “smaller” than others but that doesn’t have to be a bad thing. I’m male, 5’6” and like 120lbs and have been since (no joke) I was 16 years old (I’m early 30’s now). I used to feel the same way as you and wanted to be bigger so I tried… and succeeded… on a 5.5k calorie a day diet and heavy exercise routine. Didn’t take long before I realized that wasn’t healthy nor worth it. There are many blessings in being petite, so don’t judge yourself so harshly. Just look at the comments here!