What am I supposed to do when bunch of guys stare at me?

It happens to me frequently when I come to (my fave) local bistro. Last time I went there, I didn't wear anything provocative, actually I felt kind of bad about myself bcs I've got extra pounds since Christmas, I went there to buy my parents lunch and just after coming inside about 2 tables (6-8 guys, both younger and older) ALL stared at me.

Staring always makes me nervous, I've tried to stay calm so I just straight up went to buy that lunch, after leaving they stared at me once again. Not a usual stare either a huge CAPS STARE : They probably didn't realize how uncomfy and nervous it made me but I just couldn't respond any other way...

So I need to know, next time it happens, what should I do? I have tried to look at each of them to notice if there's not my type sitting in there but they just didn't give me a chance! :|

How to proceed
How to stay calm
I hate being like this. 23 year old and still getting easily frustrated and nervous, shy af.

What am I supposed to do when bunch of guys stare at me?
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