On Fri, 14 Jun 1996, Peter L. Ward wrote:

Watashi no baka!

Uh, Peter, are you taking/have taken Japanese? Watashi is not properly 
used here. Watashi is: 1. the feminine first person pronoun and 2. The 
formal first person pronoun for a male.

In this case, since you are male (I assume) and you are in an unformal 
discussion, you should use Boku instead.
                            
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