I wouldn't agree with that sentence anyway. Come on, sometimes you can make art being pressured by the world, especially when you do art as a job. 

It's "Art is you...", definitely, because "art" is the subject expressed by a noun in a singular form, hence "is".

If you want to define art, I would say: "Art is being free..." or "Art means being free..." At any rate, the subject of your sentence is "art" (=it), so the first one of your sentences is better.