You're asking "what are my contract rights?" and no one on Avvo knows what exact language is in the particular document you've signed. But you do, you should've read and it and understood it before you signed it, but if you didn't, read it now. See what it says about breach, and default, and repossession and dispute resolution, and remedies. Or see a lawyer for help.
Avvo is for general questions, like "are oral contract enforceable?" It's not for specific questions about any particular contract that no one's had the the opportunity to see, since that would require review of documents and discussions of individualized factual situations.
PLEASE READ THIS BEFORE YOU COMMENT, EMAIL ME OR PHONE ME. I'm only licensed in CA. This answer doesn't make me your lawyer, and neither do follow-up comments and/or emails and/or phone calls, and you shouldn't expect me to respond to your further questions if you haven't hired me. We need an actual agreement confirmed in writing before any attorney-client relationship is formed. This answer doesn't constitute legal advice, and shouldn't be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue.