Why do I seem to be invisible to guys?

So this might sound strange but I've noticed it recently. I'll start off by saying I'm not skinny but I'm not overly fat, just definitely an overweight female. I was walking with a friend and no matter who the friend is, if a guy who's a friend or stranger comes up to them 1 out 3 of those guys will acknowledge me or they just won't at all. Even when we were walking in a mall after college this girl in my class iw as walking with got approached with flyers and iw as right next to her. Then randomly a friend of mine who doesn't even know this guy that came up to a girl we were both in a group convo with, decided to fist bump her and was like "how you" and jw as next to her and he barely looked at me while interacting. Look I know I don't have a right to feel this way since I'm most likley not alone, but I noticed this happens a lot, and you have to be extremely undesirable for a man to never look at you and I don't think I'm that bad tbh. So yeah

Why do I seem to be invisible to guys?
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