A white stationary for 10mins, shape-changing-object. Possible balloon. Between fast moving clouds. Flew North slower the clouds 12mins

(4:30pm) I walked out of AutoZone towards my car. There was a chill in the air, and wind gusts at approx 6-8mph. I looked up at the low dark fast moving scattered clouds in the sky. During a quick break in the clouds I saw a white stationary-shape-changing -object. For a few minutes it was shimmering off the setting Sun.
The object was above the moving clouds. -Not going through them. For 10 minutes.
I didn't have my glasses on, I couldn't see the complete details of the object. So I asked a guy working on his truck if he could see what the object was. He said "it looked like one or two of those white spy balloons."
A few minutes later, when I was next to my car. The object appeared to change shape, *(like a pulsating piece of chewed bubble gum) and become a darker gray color and started floating North for approx 12 minutes. *(slower than the moving clouds)
(4:52pm) As the sun set and the sky grew darker I lost sight of the object. I saw the object a total of 7 times between the clouds during the 22 minutes I watched it.