I'm 4'9", weigh 108 lbs ... am I fat?!

In my opinion, no.

According to a BMI chart you are 23.4

Severely underweight < 16.5
Underweight 16.5 - 18.5
Normal 18.5 - 25
Overweight 25 - 30
Obese Class I 30 - 35
Obese Class II 35 - 40
Obese Class III > 40

If you see where you fall, your normal, but at risk for being overweight. But if you are already active working out and such, then the BMI maybe be off because muscle weighs more than fat.
If you are inactive, I would suggest making some small changes in diet and adding a little exercise to your daily routine, to lower your BMI.

Your BMI is a measurement of your body weight based on your height and weight. Although your BMI does not actually "measure" your percentage of body fat, it is a useful tool to estimate a healthy body weight based on your height. Due to its ease of measurement and calculation, it is the most widely used diagnostic indicator to identify a person's optimal weight depending on his height. Your BMI "number" will inform you if you are underweight, of normal weight, overweight, or obese. However, due to the wide variety of body types, the distribution of muscle and bone mass, etc., it is not appropriate to use this as the only or final indication for diagnosis.

I hope this helped :)

http://www.calculator.net/weight-loss-calculator.html

nope not at all. And i cant really tell if your fat or not because although the weight has to do with the fatness, i cant specifically tell. Include a picture or something next time. But you really dont sound fat.

If you put your height and weight into the little box, it shows your body mass index. You can see if you fall into the "normal" range. But you can still even be a bit over and be drop dead gorgeous.

http://www.nhlbisupport.com/bmi/

No. I'm 5'1, a girl and 110 pounds. You aren't fat. :)

Nooo I'm 5'5 and I'm 108 and I wear a zero in jeans

Nope. Im guessing your like 12, so you should be fine

i wouldnt really say so, are you a girl or guy? that does matter too.

No ur not

yeah