say he looks at me and I don't smile or anything, just give like a blank stare. They say to smile & look friendly if you want to meet more guys... but what if I just don't feel like smiling or why do I have to be the one to make a first move?
I would think she doesn't like me, or hates something about, in which case it's a signal for me not to get near her and the least thing to do is talk to her. Or a lot is on her mind and she's stressed because of that, not really seeing what's around her, in which case I would be very cautious as well. Maybe she's even angry or something, and it's a terrible moment to go talk to her.
Smiling is not considered a first move, it's not a move at all. An actual move is when you go approach the guy and initiate a conversation. You smiling is just being friendly and showing some interest. When you smile at people you comfort them, and you send a signal that it's okay to approach you, talk to you. You appear more open to others.
How is smiling in return the "First move" that is just simply being courteous. If you don't want to smile, don't, but you are sending a much broader social signal of 'leave me alone' whether you mean to or not.
I am not saying this in a bad way about you, I am just telling you how you will most likely be perceived.