need girls thoughts on this

So yesterday I posted a picture of myself on Snapchat saying how excited I am for joining the navy! Well this guy replied to it saying " aren't you to big to join?" . I'm honestly hurt by that, and he keeps asking me what's wrong, and I'm over reacting and should basically workout more. I've always been very self conscious and his comment realky made me think I'm not good enough. Thoughts? Here what I look like for a visual.