Watch the Feels Good online guitar lesson by David Santos from 50 Bass Grooves You MUST Know
This is an A A B form.
Letter A is 16 bars long with a stop on the 5 chord on measure 13 followed by a hit on the 5 chord on beat 2 of measure 16.
The repeat of letter A is 16 bars long as well.
Letter B is 8 bars long and goes to the 6 minor chord for 2 bars, back to the one chord for 2 bars, back to the 6 minor for two bars and back to the one chord for two bars. It ends on the downbeat of bar 8 to end the song.
Letter A's main riff is a two measure bass line utilizing the blues box. Bar 13 climbs chromatically from the third of the one chord to stop on the 5 chord on bar 14.