Scaredandconfused gave some great advice, as per usual.
Is this the apathy of depression, even though you don't feel especially depressed?
Might you be a bit overly medicated, causing some "numbness" and apathy?
I find it tough, and rare, to feel motivated. I feel like a sloth and it affects my self-esteem a lot. I am trying to work on this -- it's a current priority. You are definitely not alone.
I hope you can get to the bottom of this and can turn it around to your satisfaction. In the meantime, treat yourself with compassion.

WC