Approach Anxiety: noun, singular. The fear of approaching and interacting with a stranger you find attractive.
If you suffer from clinical approach anxiety, go see a therapist who can prescribe the appropriate drugs, or take you back to 1984. I can't help. I'm more of a mechanic of human interaction. Thankfully I'm the type of grease monkey most people need. That's because most people suffer from non-clinical approach anxiety—a common sort of thing that frustrates us, and prevents us from approaching a stranger we want to get to know. Most of us can function normally day to day, but when we see someone attractive across a crowded room... ZONK! We become locked into a catatonic state I call FGB, Frozen Guy Behavior or Frozen Girl Behavior.
There is a great tragedy in this world, and that is people who are legitimately attracted to each other not hooking up. I see it every day in bookstores, coffee shops and even supermarkets. Long looks over frozen bacon. He's a hottie, single-dad who enjoys walks in the park and Baskin Robbins. She's a hottie, single, karaoke singer who enjoys walks on the beach and Jamba Juice. It's not so much of a stretch to see they would be perfect for each other. But wham, bang, boom - nothing. They wheel their carts past each other as if it was commonplace to pass up your soulmate in the frozen food section. 
