Too skinny...?

Kara • "She's really gay"
Multiple people at school keep telling me to "eat a burger" or "you're too skinny are you sick?" I play sports year round and my dad makes me run races with him. Am I too skinny on top of all of that...?
I wear size zeros wth a belt if that helps. (Yes those are my tips in the second picture. I have a high motabolism as well)
I'm 5'5 weigh about 115 and my measures the last time I look them were 34 25 36