Why would you want to be a cyborg? I love being human.
It is not our choice to make nor is it a technical option for anyone today. Well, I suppose that is not entirely true if you consider someone with an artificial limb that can activate through nerve impulses as a cyborg. Do you see things like artificial valves or hearts, or cochlear implants as science fiction horror made real?
Whatever it is you imagine a cyborg to be, it will be up to future generations to decide to what extent people will enhance or augment biological systems with integrated inorganic cybernetic ones. For that matter, our mastery of genetics may be such that future engineering of human beings will be primarily in the organic realm.
As for your being happy being a human being at our current level of advancement, I would only say that everyone is comfortable with what they know and are used to. I think a pre-literate hunter/gatherer of 50,000 years ago would be just as uncomfortable to find themselves in a modern city of today as you might be in some distant future. Those in that future, however, will be quite acclimated to it.