The melody of Sorry Not Sorry by Demi Lovato runs 586 notes across 82 bars, 2:55 long in Bm at 144 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Sorry Not Sorry chords and lyrics.