Lindsay Lohan: Shut Up, Charlie Sheen!

Lindsay Lohan is rejecting Charlie Sheen's offer to mentor her, grousing that she wishes he'd just shut up.

Sources close to LiLo tell TMZ ... while she appreciates everything Sheen has done for her -- and he's done a lot -- she would NEVER take him as a mentor. She's saying she knows her life is "out of control," but doesn't think the precept, "It takes one to know one," is the way to go.

As we first reported ... Sheen told TMZ he thinks Lindsay needs a mentor and he believes he's the man for the job.

She says she's grateful Charlie gave her $100k for her back taxes and supported her in "Scary Movie 5." Lindsay says she talks to Charlie from time to time ... but gripes he has no business talking about her to the media.

According to our sources, Lindsay has been regularly meeting with a therapist and feels the consistency has helped.