I'm the seller.....all documents have been signed....but I want OUT of the deal. Can I?

What I understand is that you have accepted the offer on your property. It depends on the conditions the included on the purchase and sale agreement.

Get legal advice - meaning get advice from a lawyer not a real estate agent, a neighbour, your dentist. Realtors® are trained to advise on real estate and on forming a binding contract of purchase and sale.

There is no mention what documents were signed. Nor was there a mention of a real estate agent or lawyer involved. These factors often help when suggesting what to do.

It sounds like you have a firm contract and that can be difficult to get out of. The buyer has most likely already made plans to close and may have already sold his own place to buy yours. You should at least speak with your real estate agent and get him to ask the buyer (or his agent) if he'd be willing to release the contract. If the buyer is not willing, then you should definitely speak with your lawyer and see if there's a way out of the contract (although this is rare.) Keep in mind that by doing this, you are opening yourself up to liability.
Good luck.

Talk to your lawyer, if it is a firm deal then it will be a breach of a legal contract. Try to negotiate with the buyer to avoid the legal process.

You need to explain more. Also if your realtor is unable to satisfy, you can contact his office manager or a realestate lawyer. At this stage i cant interfere othrwise i would review your contract and advise accordingly.

It's difficult, but possible: you have to talk to the other party and try to get it resolved...

I can't emphasize Bill's comment enough. You need to talk to your Lawyer. Your Lawyer will be able to give you specific advice on how to proceed while limiting your risk and liability.