I have no problems smiling at anybody else. Old ladies, unattractive girls, below average girls, guys, pretty much everything else is not an issue in any sort of situation or casual interaction. I've even worked hard on having conversations with random strangers. But I can't bring myself to smile at girls I am interested in when I make eye contact. I'm a beginner and just recently got eye contact down, but I haven't been able to progress to smiling.