I don't know that any artificial sweetener (i.e. Splenda) would fall under the umbrella of "whole foods" or "natural lifestyle". If you're looking for a more natural alternative to white sugar, I'd recommend raw cane sugar, agave, honey, or maple syrup.
"There's no such thing as failure. There's only feedback. Stop judging yourself & start recognizing it for what it is, an entry point for learning. The truth is, if you're not failing then you're not really reaching & really trying. If you don't like the outcome of a situation, learn from it, make corrections & reapproach wiser & stronger until you achieve your goals."