You passed the checkride. Congratulations. Now your family wants to go somewhere in the airplane.
There is a big difference between flying a planned test with an examiner and taking people you love on a trip where the weather, airport and schedule may all change. If you feel that difference, I understand. I have heard pilots describe feeling oddly empty after getting the certificate they worked so hard for.
That feeling does not prove you are a bad pilot. It does tell us to look more closely at what you actually learned and what you still need to practice.
The test has a job
A checkride establishes that you met a standard on that day. It is an important standard. It is also an imperfect picture of the flying you intend to do next month with your own passengers, airplane and equipment.
You may have practiced the same few approaches near home. Then your first family trip takes you across unfamiliar airspace to an airport you have never seen, with a clearance change just as your passenger asks how much longer it will be. That is a lot of work to invent in real time.
I am not suggesting you wait until you can guarantee that nothing will surprise you. Nobody can do that. I want you to know which parts of the trip you can handle, which ones are stretching you and how you will respond when the plan changes.
Build evidence, not a feeling
Here is a useful question before you put the family in the back: Can I explain this flight from departure through arrival, including what I would do if the planned arrival stopped working?
Explain how you will leave. Tell me why you picked the route and altitude. Show me the weather you expect to matter. Tell me when you would stop, turn around or land somewhere else. Then show me how you will use the equipment in your own airplane to make that plan happen.
If you cannot answer one of those questions, good. We found something specific to work on. That is much more useful than calling yourself an impostor and hoping another twenty hours will cure it.
Work through the trip with an instructor who lets you make decisions. Practice the changed clearance, unfamiliar airport and inconvenient weather. Debrief where the workload started. Sometimes the issue is flying skill. Sometimes it is planning or avionics. We need to know which one it is.
Your family does not need you to act fearless. They need you to be honest about what the trip requires and prepared to make a different decision when the facts change.
The certificate is worth celebrating. Then keep building the capability behind it.