Obviously your asking this question so people say your hot to fuel your self obsession. So you say your attractive and guys lik you, and than you ask if because a mole is on your chin, your ugly? I think you already answered your own question. Why don't you quit looking in the mirror and go back to making fun of less fortunate people.
Think of it as a Beauty Spot, hun. I really don't think it matters to a guy, and if it does, then they are a total douche and not worth your time. Be happy with who you are. Stay confident, and guys will love you for it :)
I have seen lots of pretty people with moles on there face. Having a mole just makes you stand out from everyone else. I have something on my face that makes me look different but my boyfriend still thinks I'm pretty.