If you are "reversing your progress", you retrograde as mentionned by @WillieWheeler.

If you are "undoing progress", you stagnate.

Definition : to stop developing, growing, progressing, or advancing.

Considering your example "This is so... ", demoralizing may fit.

If you are "reversing your progress", you retrograde as mentionned by @WillieWheeler.

EDIT after @Barmar comment: If you are "unproductive" (not counterproductive), i.e. stationary (not reversing), you stagnate.

Definition : to stop developing, growing, progressing, or advancing.

Considering your example "This is so... ", demoralizing may fit.

If you are "reversing your progress", you retrograde as mentionned by @WillieWheeler.

If you are "undoing progress", you stagnate.

Definition : to stop developing, growing, progressing, or advancing.

If you are "reversing your progress", you retrograde as mentionned by @WillieWheeler.

If you are "undoing progress", you stagnate.

Definition : to stop developing, growing, progressing, or advancing.

Considering your example "This is so... ", demoralizing may fit.