Hello, I applied for an extension and I'm now wondering what to do, I don't think I'll end up owing so I wasn't planning on paying anything on April 18th. Should I at least pay my state taxes?

Yes, if you file an extension and you owe, the extension extends the time you have to file, not the time to pay. It is always a good idea to pay as close to the amount you think you are going to owe to reduce the amount of interest and penalties.