If your 14(girl) and weigh about 110 pounds, is that healthy?

How tall are you?

Being 14 means your body is still growing and

I would not be to concerned about your weight

Height and Weight Chart - height weight chart, weight height chart

Height to Weight Ratio Chart

Eat right -- exercise -- snack healthy

I am about 5 feet 4 inches

Well, that's not really overweight. I weight 109 pounds, I'm 1m70cm. I am considered underweight by my classmate. I'm 17 though

"14 year old (female) child who is 110.0 pounds and 5 feet and 4 inches tall, has a body mass index of 18.9, which is at the 43.9th percentile and is considered to be a healthy weight"
Your Child's BMI Predictor Results - Keep Kids Healthy

There you go perfectly normal! You have to use child BMI charts because the adult one won't be relevant until you are about 20.