Hi Dave...waves you over....a lot of us understand; Feeling unworthy of "praise" and apologetic hits home for me...
It is hard to put into words but I will try...every one of us deserve praise...just getting up in the morning is not worthy for applause...your kindness to other here, your sense of humor and you Dave is worthy of, What a neat guy is Dave.
For whatever reasons, we didn't get it growing up...thus didn't get shown how to receive proper affectionate praise; try and look at it from outside of Dave, if someone else said the encouraging things you say...share their inner thoughts...you Dave would be one of the first people to say; good job; thanks for sharing...so you need to be a bit kinder to yourself...this isn't filled with holes because most of us here would say good things about you...
It will always be 'hard' to accept...it's a hard habit to stop saying sorry...especially because you honestly feel sorry...but be assured that you are worthy and that you are thought very fondly of....