I think it’s a Annabelle just starting to bloom ... here are some pictures I believe is a Annabelle growing under my deck

Agree with Babs - Hydrangea arborescens, but most likely an example of the species rather than 'Annabelle'. Annabelle is a specific cultivar that features very large, fully rounded mophead type flowers comprised primarily of sterile florets. But the species itself is very variable wrt to flower type - it can produce flat corymbs of tiny, mostly fertile florets (like your photo shows), lacecap type flowers with the center cluster of fertile florets accented by a perimeter of the showier sterile flowers or the more familiar rounded mopheads....but much smaller in size than Annabelle.

Thank you everyone. It does look to be Hydrangea arborescens. It doesn't produce the large Annabelle blooms at all, so it being an example of the species makes sense.