is this a real condition?

Well....... sure - it can be a real "condition". could be you were raised in a loving environment by people who gave you the positive feedback you needed to feel good about yourself - they didn't beat, starve or abandon you....... and you're now a "normal" human being. You feel the way a human being is supposed to feel.

OR......... could be that you've successfully repressed any abuse you did suffer so much that you are now completely unaware of how miserable you really are. That happens too.

There's plenty of terribly neurotic people who have made up a little myth of a "happy childhood" - and they can go on for years believing this. But these people are miserable too - and never know why. If you're not miserable, then sounds like you got a good deal going.

Too bad you couldn't put it in bottles and sell it because there's sure lots of people who would like to feel NOT depressed and NOT unhappy and NOT stressed.

It's just you, there's no condition that stops people from feeling down or depressed, you're absolutely fine.

No, it just means you are a happy person

It could just be being optimistic, and your lucky you have that