Should I lose weight?

I have been feeling very fat these past couple of days. Even though I work out and eat healthy (the majority of the time) I still feel like a fat pig. All these skinny girls prance in front of me and they are like "Oh, I weigh 75 pounds. How much do you weigh, Izzy?" And I am too embarred to answer. Otherwise I lie. I weigh 105 lbs and I'm 4'10. Is that too big? I really don't look like I weigh that much. I have no idea how much of it is muscle.