I cant gain weight

Olivia

So I’m 15 and only weigh 100.1 pounds which worries me. Last summer I weighed 115 pounds and since then I’ve been losing weight pound by pound and I don’t really know what to do, I just can’t seem to gain weight. Can anyone give me some tips or something to help me? Update I just checked my weight today I weigh 96.8 pounds now.