When you say "talk to girls" do you mean chat them up? Because it seems to me if there’s any reason for this than its the fact you consciously or subconsciously associate girls with dates and relationships and that. This puts more pressure on you when you go to speak to a girl. If your straight and I am assuming you are then guys are not a problem because you don’t want to sleep with or date them, so if a guy is mean to you on here you just block them and move on, however if a girl does then its a rejection.
That’s my theory. Does it make sense?