Guys will only really talk to me when they're drunk

So basically I've found that whenever I'm around guys that I don't know they always completely ignore me, honestly its like I'm invisible! However if they are drunk I always get guys coming up to talk to me. I was wondering whether its because a) i might come across as intimidating in some way (I'm quite quiet) or b) I'm so ugly that guys will only pay attention to me when beer goggles come into play. What do you guys think?

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