Lindsay Lohan -- I Don't Do Bar Mitzvahs!

13-year-old Jewish boys will have to come of age WITHOUT Lindsay Lohan's help -- because the actress does not do Bar Mitzvahs ... despite recent claims by a talent agency trying to pimp her out for small-scale appearances.

A North Carolina company called 123 Talent recently sent out mass emails, offering to book Lindsay for personal appearances, weddings, and Bar Mitzvahs.

A booking fee isn't listed on the message -- but Lindsay's film credits are ... "The Parent Trap," "I Know Who Killed Me," and that creepy Disney movie with Tyra Banks called "Life-Size."

And now, Lindsay's pissed -- insisting her career hasn't sunk so low that she'd be forced to do anything like a Bar Mitzvah or a wedding ... not yet anyway.

What's more -- sources close to the actress tell us, Lindsay NEVER signed a deal with 123 Talent and never agreed to let them represent her in any way ... so the email is totally bogus.

The CEO of 123 Talent -- which still claims to represent Lindsay on its website -- tells us, the pitch was NOT bogus but Lindsay's team has since "decided to go in another direction."