many people, girls especially, pick up on this sort of thing intuitively, and make decisions they can't quite explain based on these subtle signals. this can be frustrating to one who consistently finds themselves left behind w/o an explanation, but you're not owed one tbh
best advice I can give for one in that situation is to stop being anxious. work out, learn coordination sports, mb even dance!
most importantly, learn to be PRESENT, to pay attention to the reality of your partner, not your idea of them. SENSE where they are & meet them thereo