I am wondering if i have early signs of OCD?

That is textbook OCD. You have an obsession, worrying about the registration or the locks on your car, and a compulsion to alleviate the stress cause by that obsession, checking for your registration, insurance, or locks. I would go see a therapist. You probably just need to talk about your obsessions and compulsions with your therapist and be placed on some anti-anxiety medication.