What is complete happiness? Is that to mean no upsets or anything negative whatsoever?
I don't believe that is attainable for anyone.
A mindset and a heartset... that is what makes me a bit happier than some. :)
I don't have the perfect life or no worries, but I have many blessings and I choose to see those rather than what may not be right.
What is right in your world today?
How we see things, how we choose to see things and how we choose to deal with things can make a huge difference.

There is no complete happiness. Lol

the fact that complete happiness is only a concept. most of us spend the majority of our lives in a neutral state with intervals of happiness and sadness. we try to escape the bad times and always have only good times. the trick is to enjoy the sweet spot between

Complete happiness is an unrealistic goal and unattainable. Contentment is what we should be aiming for, with many moments of happiness.

nothing. I've got a loving husband, 2 great kids, food on the table and a little extra to do some shopping.

The thoughts I tell myself.

My mortality :)

I am pragmatist/realist, not in a fantasy world, which is what your question is insinuating.

Nothing. I’m usually always happy. I have temporary moments of being mad or sad.

My insecurities and unresolved trauma

The nightmare that is my body. :)

The fact that our moments with our loved ones are limited and short-lived. With each passing second we have less & less time to spend with them, until one of us leave this world.

Usually a spoon.

I'm not sure I will ever reach the pinnacle of happiness.

Real life.

Loves ones being envious of me. It's always the ones closest to you that hurt you the most