Is 111 lbs for a 5'1 female overweight?

I fluctuate between that and 114 lbs. I've never thought of myself as fat but apparently a lot of people who are 5'1 are like 100 lbs or less. 
My lowest weight was 105 lbs, but that was when I was 15 and actively involved in sports. 
Now I don't get tons of exercise but am still kinda active, I eat okay, and I remain at 110-115 lbs. Is that too much for my height? I'm 18 years old and petite (obviously because I'm short lol)  My BMI is 21 apparently. I know that's supposed to be normal weight but I just feel really chubby compared to my other short friends. 

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