Backing out of swearing in/signing a contract

I'm not here for everyone to call me a piece of shit etc, just hear me out. I got accepted to OCS for IW, and was set to ship in August. I was already to go, but found out that I got accepted to attend my dream grad school in the fall. It's an opportunity that I can't pass up. I would like to reapply to the navy in the future, I just can't pass up this opportunity.

The problem is that I already swore in and signed some papers. Am I able to back out now? Are there any consequences?