Not fully hard I don’t understand

So saw my girl and it’s long distance but basically we were in a rush and we were in the back of the car, I was quite nervous and anxious cause like we were in a car park and also I had some errection issues in the past but like I got hard but not like fully, I just wanted head, but I don’t understand why it didn’t get fully hard

Sounds like you’re just pressuring yourself a lot. I’ve been there myself!