When I approach, or stay closed to some girl at the gym, work or a random place, and I talk to them, some girls stay nervous, at least I think they do, I would like to know if they are nervous or just being autistic, because I make good jokes, a lot of people enjoy my humor, I know how to talk. Its fun besides sucks, that some girls which I approach stay like freeze... I make jokes, they laugh, I try to lead the talk, and they just freeze... What is the explanation? are they nervous or are they so serious that they don't know how to be just friendly? their reaction is more like tension, than indifference, they laugh but they freeze. (just to brief describe me: normally people love me, they invite me to their party's, they invite me to have fun, I am very communicative, not a creepy guy that approach every person with a knife on hands.)