Happy people don't normally have such meta-cognition about their happiness, deducing it in complexity and purpose until it no longer produces a feeling.
In most cases your reality is NOT what you make it. You can't bend spoons, you cant fly, you can't stop time or shoot spider webs. When you use the same concept in context of how you FEEL, things are different.

If I described to you biting into a juicy ripe lemon, the sour juices gushing into my mouth, the smelling the pungent mist emanating from each bite... you might in fact salivate without actually eating a lemon. Whatever you think, or imagine, your subconscious doesn't know the difference, and will alter your physical state as if it were true.

If you believe that happiness is a lie, you will only feel depression. Even if it is just a pondering, you may start to feel a truth, until it spirals.

If you believe that you are capable of honesty then you must believe that others out there are too. I am honestly telling you that genuine happiness is possible. It is real, even when you are completely aware of yourself in the moment.

You can never not exist. Sorry we are smart enough to even conceive a hypothetical thing, but nevertheless it isn't real. If it were, you'd just be something else, with a different life. Because that's all there is.