You can fix this by doing the following:

1) when in the car, click on the camera in the upper right hand corner to open Tony's First Person Camera menu.

2) go to the << X axis line >> and slide the bar on that line back and forth until you are back inside or on your vehicle.

Note: the << Y axis bar >> moves you up and down so you can actually sit on the car's roof if you like by using that.

Hope this helps, Matze
:^)

You can play with this menu any way you like, Matze, with no fear of hurting your first person mod .... because there is a button at the bottom of the first person menu screen that will return you to the original settings.
Have fun.
:^)

Thanks, it works!