I'm learning to parent myself as well. Sometimes, when I'm especially low, I actually TALK to myself, out loud because the scared, fearful, feels unworthy little person inside needs some loving guidance. I tell myself that it will all turn out okay, that I don't have to do everything today and I don't have to be perfect or even right, I just have to do the best I can TODAY. And it helps. It might help you.
I also practice affirmations. I am enough. I have enough. I will be okay.
Sending hugs and good energy your way, Serenebynow.