A hit and run is generally termed as a person fleeing the scene after hitting a pedestrian or car. It does not appear that you fled the scene but left a note after waiting and not finding the owner of the vehicle so it is doubtful that in most states you would be charged with a hit and run.
State laws vary about what you should do after hitting an unattended vehicle, some require you to call and make a police report. Most all states require you to do your due diligence by trying to find the car's owner. If you are unable to do so a note should be left in conspicuous place listing your name and address and if you are not the owner of the car also the owner's name and address. Also state what the circumstances were that caused the damage to their vehicle.
If the owner of the vehicle that you hit does contact you and file a claim with your insurance company it could be a possibility for your rates to rise but that will depend on your insurance company's ratings guideline.