I dont understand this, help! Its Shakespeare?

She's confessing that she's desperately in love, but not worthy of the object of her desire. She's asking for approval, even though she knows it's unlikely her love will ever be returned. Basically, she's laying herself on the line -- asking the mother for empathy and promising she'll do everything in her power to make herself worthy of the son. It's a desperate plea from a desperate girl whose obsession has taken away her powers of reason.