29y M , burner acc cause I dont want anyone to know this

  1. I see a girl I find attractive.
  2. I want to meet/kiss/fuck her.
  3. She notices I am interested like that.
  4. Immedietly I feel fear, like dread. I am afraid to show interest, approach or say anything. I just stare empty - locked in place between desire and fear.
  5. She sees I dont have the guts to do anything.
  6. She immedietly becomes disgusted by my weakness and its game over.

This has been happening to me since puberty, so since the start. Why am I like this? Sure I am a loser and a coward - but why specifically? What is it that causes this? Only happens with girls I am attracted to... if I am not attracted to a girl I can interact normally and 2 times these girls became interested in me... I would like to be able to act normally and without shame and fear with girls I am attracted to. On the other side, if a girl shows clear interest in me - I also become scared and run away or self sabotage.......... any ideas?