The car can fully self drive -- it has full control over steering and brakes, can pass other cars and even enter/exit the highway.

My car has limited self-driving, it can only do limited lane keeping or keeping distance from the car in front.

So you're defining it as the capability to automate steering, accelerator and brake? (i.e. the three things that constitute driving)

By that definition self-parking cars can also fully self-drive.

My definition of driving is being able to do all the tasks required to pass a driving test, i.e. driving around a city (intersections, roundabouts etc.), motorway, country road and car parks.