The ability to take something completely ordinary and put it into a new context is abstract.

Breaking down your own creative barriers and force something new and unrecognisable is abstract.

Looking at a stranger's picutres of a long lost friend is abstract.

Painting a single stroke of paint is abstract.

Thinking back along a time where art could stand by itself and you just watched is abstract.

Going for a walk is abstract.

Think outside of your context. And then, my friend, you are abstract.