if your experience made u lose confidence, then it's more or
less failure to meet your own expectations or other ppl's
expectations, which means u do not have what it takes to be
confident. to be confident = u must be 'ei gan' to a certain
degree. if u r 'gey gan', u will not most probably meet
expectations and as gasband says u might be a unrealistic person
instead of faking or not having confidence or whatsoever.
confidence need to be built up, not gained overnite