Have a look in your paypal home page for a section called "Pending" I imagine your money is here, below is PayPal's text on the subject
"To keep your money safer, we're placing your payments from sales to one side, in your pending balance. This is commonplace for new or inexperienced sellers, but can also affect experienced sellers. As long as there are no problems with the transactions, you’ll have the money within 21 days."