I disagree with Dale M's answer.
The contract might or might not be enforceable depending on the
evidence produced by the parties.
Meeting of the minds
Contracts must meet specific requirements in order to be enforceable. Being "signed" is not one of those requirements. But having a "meeting of the minds" is.
Just like any civil case, the standard for winning is a preponderance of the evidence — meaning the winner will be the one who provides more evidence supporting their position.
Your problem is that your signature gives the other party evidence to support their claim that you agreed to the terms of the document and, therefore, the "meeting of the minds" requirement was met. In other words, the evidence of your signature provides a rebuttable presumption of a contract. You can rebut that presumption with evidence of your own. But you will have to prove your case by producing evidence.
Your evidence will need to be more than just a contrary assertion (i.e., the "I didn't read it" defense). As your simple assertion can be cancelled out with an equal and opposite assertion by the other side. And the other side would then win the preponderance battle based on the signature. Your new evidence needs to outweigh the evidence of your signature.
Non est factum
You might also have the legal argument of Non est factum (it's not my deed).
Hire a lawyer
You really need to have an attorney who specializes in contract law analyze your case and advise you.