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Possible Duplicates:
Is it ok for non-japanese to refer to themselves as 僕(ぼく) and if not why?
How should I select what first-person pronoun to use?
How commonly are "あたし" (atashi) or "僕" (boku) used in Japan?

one teacher said:

When we are talking about kids, we differenciate boys and girls

  • 私:for girls
  • 僕:for boys

for adults, it doesn't matter

another teacher:

it's expected that I refer to myself as 僕 always, because I'm a man

one japanese friend:

僕 seems little cute

my brother:

always use 俺 within friends

...
I always try to use 私
how is the best way to say "I" or "me" (for boys, and for girls)?