I’ve always been skinny ever since I was little. I have a super fast metabolism and have never been able to gain weight at a normal pace. I’m now 20, 5’2 and 91 pounds. I’ve taken every blood test and health screening to make sure I don’t have any health problems and my doctor concluded I just burn calories very easily and metabolize food very fast. My worry is that if my BMI continues to stay this way I won’t ever be able to conceive kids and its been on my mind very heavy. I’ve tried doubling my calories and working out along with it and saw no results. I’m trying protein shakes now and was wondering if anyone has any advice? I really want kids someday and I’m scared that dream won’t come true due to my weight.