To get into this point a little deeper, directly focusing on your feelings of emptiness: a creative act is an imposition of your will on reality. Your very thoughts, ideas, dreams, are being made reality. You are bringing into the world a physical manifestation of your spirit, which is not only a defiant act that says, in however small way it is, that "I am here, I am alive", but which reinforces your sense of self even further.
That's why you feel good when you make something, even if it's not exactly how you wanted it to turn out. You made something out of nothing, the world is added to, and that addition is yours. Even better if the thing you create is then something that gives pleasure to another being, because part of you has enriched the spirit of another.
This is all an overexplanation for the fact that when you, say, knit a hat and give it to someone as a gift, and they appreciate it, you feel great, not just in your work, but in the empathetic feedback of seeing someone appreciate that work.