The more I think about it, it seems that long-term happiness is something many people spend their lives seeking OR they believe it’s something they used to have and lost.
That makes me wonder if we are truly ever happy? Or if it’s something that is always just out of reach (in the future or in the past).
Exactly. I’m not a psychologist or biologist but from what I read, while we are alive, our bodies tend towards homeostasis, a chemically balanced state. Simply, you cannot be in a high-dopamine “happy” state all the time without going back to a neutral or down state afterwards. Even without drugs, highs are usually followed by lows. Not trying to be happy at all times but accepting that sometimes, there are hardships, will help you having a fullfilled and content life.
Anyway, that homeostasis does not mean that everyone is equally happy/unhappy on average. On the one side there are people with depression and on the other side people whose lives have many happy moments. What helps for me is connecting with friends and family, going into nature and seeing animals, doing exercise and having off-screen time, mindfullness and generally having some work-life balance. Which I admit not everyone can afford and I am privileged to have. Doing or having those things helps me having a happier and more fullfilled life, but sometimes life still sucks, there is no happy-all-the-time.