Why do I feel overweight?

I'm 5'3" and weigh 130lbs. This is considered healthy and average weight. Most of the time I feel fine, but every once and a while, especially when I'm sitting down, I just feel so overweight and insecure. I play sports and eat healthy and affording to everything I see, I'm not fat. The only reason I can think of this is that most of my friends are unhealthily skinny. A few of them are like 110lb and are 5'7" or so. Do I feel fat because I compare myself to them? Or am I just actually on the heavy side?

Why do I feel overweight?
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