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The adult male feels unsure about himself during his encounter with a girl he finds attractive, causing a surge of cortisol to be distributed throughout his nervous system, meaning that a disturbance in his brain chemistry is involved with the interaction.
The purple line indicates the stability of brain chemistry of each individual. They 'sense' each others brain chemistry by a mechanism that has yet to be validated by neuroscientists. When they don't sense any disturbance in the brain chemistry of the other person--the people establish a connection with each other. Before the interaction the female had a steady flow of serotonin being distributed throughout her nervous system, making her feel alright, not bad, not happy, just content.
When the unsure male approached her, she immediately sensed a disturbance in her brain chemistry. She doesn't quite know why it is, and she probably dismisses it as a 'bad vibe'. But she does not feel safe in his presence because of the disturbance, and so she avoids him henceforth--leaving him with even less confidence in himself than before.
This is nothing personal against him, the female is simply following her gut. Her visceral responses, which is what most people do, althought they do not understand the reasons.
All mammals have a sense of connection with other mammals.
We've all seen how some people are able to stay with incredibly dangerous predators--lions and whatnot, and feeling 100% safe.
It's simply because they're not afraid. They don't fear the lion because they have more advanced senses to other people and animals. Animals literally sense each others fear.
If you're afraid of an animal, the animal senses it and becomes afraid itself, interpreting you as a possible threat and so it attacks you and kills you.
This is what happens inside of the brain of a male with insecurity and low social awareness. The reason for why the male fails to establish connection with other people is because of a some sort of a deficiency in discerning the brain chemistry of others.
He sees the person but he doesn't sense them.
And if he doesn't sense them then he becomes unsure, and when he becomes unsure a hormone called Cortisol gets transmitted throughout his nervous system, and others who do not have his deficiency will sense that disturbance and feel a sense of visceral response in their limbic system, telling them to avoid this person because they cannot know his intentions.
Connection and friendship between human beings cannot be establish without trust, and when there is no sense of connection there can be no trust. Which is why this socially deficient young man will have a much areater difficulty in forming friendships and relationships.
If you are a man and you have social difficulties, then this explains it. Upon understanding the reasons for your failure, you can begin bettering yourself, and understanding that when you are talking to a person, the brain of the person is involuntarily sensing your brain chemistry. If you are stressed, your brain will produce cortisol, and the person you're talking with will sense it.
When that happens the person will want to avoid further interaction.
The way to prevent stress is to think to yourself during the interaction and direct it towards the person--You have nothing to fear, i am friendly, i want to be your friend, i want you to feel safe in my presence and i want to enrich your life with my personality.
You want to aim to prevent the person you're speaking with from being exposed to cortisol--or a sense of insecurity in your presence.
It's not that you're incapable of establishing a connection with other people, it's just that it's harder for you, but when you realize the actual science behind successful communication, then it will be easier to control situations. Interaction is nothing but brain chemistry. It doesn't matter what you say, just as long as you feel secure, and that you make others feel secure in your presence.
When people meet for the first time and interaction occurs--that's essentially the determining factor of whether or not the interaction will be successful or not.
If you feel insecure before the interaction happens, then the interaction will fail.
If you go inside of your mind during the interaction instead of focusing on projecting positive feelings towards the person in front of you--you'll start feeling self conscious and therefore stressed.