Why do people assume I have a girlfriend or that I should have a girlfriend if I'm ugly and short (5.10)?

My friends and older people ask me if I have a girlfriend and if I say no, they tell me that it's because I don't want to and that I'm too picky and I don't go out enough. I had cute girlfriends at some point so that's probably why they think that. Or when I had a girlfriend who wasn't a conventional beauty, people said I could do better. I'm generally quite socially confident, despite knowing I'm ugly, or at least that's what my face looks like. My jaws are not defined, although I'm slim and they are a bit uneven. I also have a round face.

Why do people assume I have a girlfriend or that I should have a girlfriend if I'm ugly and short (5.10)?
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