I am sorry that you are self-conscious about eating in front of others!
Yup, some do judge, some don't, but it's the ones who actively look at me, peer into my container, ask 'what is that!?' that really make me
If I let it bother me, then that is stress on me that I do not need!
I can be mean and say, um, what the eff are you staring at? Or say 'none of your business' or I can stick out my tongue at them, all covered with my masticated food, or just turn my back (this is at work, and it's my employers, husband and wife who call people 'fat' behind their backs).
I usually just say 'food' and turn my back on them.