The fact that you can see life in other people is enough to believe your existence is real and not a delusion.
I have no problem accepting my own existence. It's the only thing I can really be certain of. The existence of matter is an assumption, because all I have is my experience of it. I can't prove that my experience corresponds to reality or that there even is a reality beyond my experience. To assume a creator of matter is to make an assumption about an assumption. Quantum mechanics even provides experimental evidence that indicates matter needs consciousness to exist. If you insist on an always present consciousness, it's simpler to look inward than outward. You are asking good questions, but identifying your hidden assumptions might help you to ask even better ones.