May we stand judged by our own actions and words and not by SEO posts portraying them :p Aristotle is well worth reading for someone interested in philosophy, but he himself did not claim to have discovered how to be happy (he thought of himself as explicating and systematizing what everyone thinks about happiness), his notion of telos (poorly translated as 'function') is not subject to your rightly raised objection, and, though he did believe that humans are distinguished from non-human animals by possession of a rational faculty, he thought we shared with non-human animals the capacity to feel.