You're definitely not failing at poly, you're kind of getting the short end of the stick though I can see that G and H are both putting forth some efforts to help. NRE can be quite a drug and can impair people's judgment. Increase the amount of communication between you, G, and H if you can. Let them know what you're feeling and why. Maybe they can't fix all of it, but maybe they can help with some of it. Let them express their feelings as well and be a good listener.
I hope things will get a little easier, and that you'll keep us posted here and let us know how we can help.
Love means never having to say, "Put down that meat cleaver!"