• Quote:

  What causes someone to feel confident and happy when inside the home, but lack confidence and feel anxious when outside the home?

Low self confidence, anxiety issues.

• What interventions are effective in increasing confidence and reducing anxiety in such circumstances?

Exposure therapy, mindfulness... slowly learning yourself to interact and realizing nobody's going to bite you and you are not gonna die. I carry Bach's Rescue Remedy in my purse for case of bad anxiety...

• Is this phenomena related to high levels of emotional sensitivity?

could be. Emotional shielding excercise can help a lot though.