Are you healthy or underweight if you are almost 5'7'' and only 113 pounds?
You are a little under-weight, but don't worry about it. I'm 5'
6" (over-weight by 20 lbs.) and should be 128 - 135. If you are
fairly young (teens to 20s) then your body will generally regulate
itself. Just eat well and your body will do the rest. It's better
to be a little thinner (not skeletal) than too over-weight.