This is normal for low houred PPLs.
They way to get over it is to just get out and do something...For example, plan a flight from A to B (somewhere you have never been) then go and fly it even if you feel nervous. Next time it'll be easier, and you can expand your horizons. I'd take a mentor with you for a few flights, there are many people who'd be happy to sit RHS just to help give confidence. I would, I often do it with other group members, and keep an eye on the nav and if they want do the radio work.