The bodylanguage thing I know what your talking about, i realized it from this one girl I used to just attract over and over each day. But one day she told me to move my chair because I was to close. An what I realize its like a Boundary space between each person. Like the more direct you are Bodylanguage wise the more uncomfortable you get.
Like say if you was right next to a girl but leaned back, you/her/both will be more comfortable because your not making each other uncomfortable. Same if your to her side and have her head str8 and talking and once in awhile just looking to the side.
I did that the next day to the same girl and she had no problem with me being so close and then she was more comfortable. (Note when i say lean back it doesn't have to be no lean back to the point its uncomfortable)
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As for approaching there is only 1 way that I found you will be able to approach. This used to be my biggest sticking point, I tried
Psyching up (Helps before your there but when your right there in the field that psyche is gone)
Building confidence
Finding motovation
But then I realized, the easiest way is to just walk up without thinking and say something. At that point your stuck in the interaction, so your now forced to continue. After that 1 approach your thinking "This is what I couldn't do" and then go off and approach the 2nd and you will be fine. You have to just see her and walk over and approach don't think WTF your doing or anything just do it.
The first set I ever approached was a 3set, when a friend wanted me to approach and he said I was scared, I just fuvk this and went across the street and said "hey quick question" I did'nt know wtf I was doing I just knew a opinion opener started like that and I knew it would get them to stop. Got the UG and 1 of the hbs to stop and the 3rd girl tried to keep walking but realized her two friends had already stopped.
After the opener which I guess was "Hey quick question" because my followup was something retarded about one of my friends liking her, I didn't make no sense lol, the girl even pointed it out. But it worked the stopped and I opened. (Keep in mind my bodylanguage was real good when I opened and I wasn't even nervous I didn't even have time too, unlike before I was in the community and I approached a girl and I ended up shaking so much that she noticed)
So just go and do it trust me doesn't matter how stupid your approach was cause I didn't feel bad at all, because the girls were still opened nicely with a half ass opener, which had no purpose because I didn't have no question to really ask. But after I felt like "WTF I just opened a 3set I said I would never approach a group because its hard, but it was rather easy, way easier than I had thought" I think Building rapport could be hardier than Opening, opening feels like the hardest thing but is by far the easiest.