Why do people always assume that I'm taken?

Why do guys I have no interest in approach me like all the time? Even though they assume I'm taken? I know I'm not ugly but the ugly guys seems to be drawn to me and I'm thinking I must be doing something that make them feel like they have a chance but I don't know what that is... I mean all I do is go my way and ignore everyone unless I know the person I say hi but then those guys... this is pointless I'm done lol
Why do people always assume that I'm taken?
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