Welcome, TiredPrayer. Glad you are with us. Keep posting.
I'm a single mom too, of a 10-year old. I'm also notoriously bad at asking for help. Part of it is being proudly independent, part of it is not wanting to be a burden, and a part of it is fear of rejection. I've also driven to AA meetings only to sit in the parking lot and talk myself out of going.
We're all in this together, and together we are stronger than our individual selves.