I cant like a girl at all unless she genuinely likes me

It's to the point where it doesn't matter how beautiful a girl is if she doesn't like me back then my guard is up and I just cant be attracted. Yes I do somewhat get aroused looking at girls, its normal at age 20 (though not nearly as much as when I was 14)

Let's say a drop dead gorgeous women was talking to me and she was giving me mixed signals then I would not like her no matter how good her looks are. Yes I would be a bit saddened that she didn't have the personality or that she didn't like me just because of how good looking she was but I would get over it. Likewise if a girl I have little attraction to physically showed great interest in me then I would be much more aroused to her than the beautiful girl.