If you don't have a place to shoot then why not join or form a club, get insurance, make a CASH financial offer (ie hire) to a landowner for somewhere to shoot. Almost every farm I know has at least one out of the way "dumping place" that they would love to hire out for even plinking (as long as access isn't going to be a problem) at weekends or even one specific afternoon per week. All you need in return is a simple hand written note of permission.
As long as you're not covered in tattoos, are sensibly dressed etc, there really shouldn't be a problem. if you get permission, remember that at Christmas farmers usually don't mind a nice bottle of whisky or wine.
You could also try contacting your area's police firearms officer, who may be able to put you onto a local club or possible place to shoot. You would be surprised how many police officers shoot, even airguns.