Ways to gain weight?

Im struggling with trying to gain weight, and it's killing my self confidence. In high school I weighed between 125-130 lbs, had good muscle tone, everything! Now three years later I've lost all that weight due to stress and having to couch hop on and off for two years. I wasn't able to eat much, I was lucky to maybe eat once a week. I then got pregnant with my daughter and was finally able to get on my feet with an apartment, but as soon as I gave birth I lost every pound. I now sit at 110 lbs and have been eating good, but I'm literally seeing no progress with my weight gain. I just want to have the confidence back that I had. I'm tired of feeling so little and everyone making up rumors im on drugs. Or being told by other women I need to eat a damn burger 😡😡😡😭😭😭