18 y/o vegetarian male in desparate need of body mass gain!

Hello all,

I'd like to introduce myself and explain why I'm here. At 5'4 and 85 pounds, I'm currently very underweight. I think my BMI is close to a 15!! My ribs and ribcage are all visible. I have slightly underdeveloped muscles--I look like I'm in shape, though, probably because there's little to no fat on me. I'm frequently cold and my legs are always tired. I have recently made big changes in my diet in the past two months--incorporating more protein and lifting weights. I used to feel sluggish and get bloated after eating, and I think I was suffering from anemia and protein deficiency--I feel so much better and energetic now that I've changed my diet, though! But today I hopped up on the scale and noticed that instead of gaining weight, I actually dropped 3 pounds (I was at 88 last time I weighed myself)! What am I doing wrong? Why can't I gain weight? Help me out, guys, I'm pretty worried!
 
As long as milk is still ok for you, assuming not vegan here, this program will make you stronger and put on weight for sure when followed.

Overall keep up the lifting and continue the protein because both will help you get stronger and put on weight.
 
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