Permanent crown on lower jaw tooth had a crown put on 4 days ago no root canal slight pressure when bite on harder food kind of uncomfortable norma or?

See your dentist. Your dentist should be able to check and adjust the crown if it is too high and the bite is not comfortable. Takes only a few minuets.
Crown and discomfort. When a new crown is placed, the tooth may have some sensitivity to biting or temperature for a few days. However that should subside and if it does not I would return to your Dentist to be reevaluated.