Hi onefiftyone,
I concur with what's been said...

You should only use a physical response on the street as a last resort for righteous self-protective purposes.

Okay, in regards to improving your confidence, here's how to do it in a nutshell; join a reputable gym and live/breath the 5 D's--Desire, Determination, Discipline, Dedication and Diligence. I guarantee that you're confidence will positively evolve if you keep your ego and perspective in check as you apply these qualities to your training.

Anyway, take care and good "luck" ("luck" meaning when preparation meets opportunity).

Best Regards,
Lito