As a kid, I was pretty much constantly very social, lively and chatty, without any of these apathetic down phases. I kinda trained myself into these due to negative social feedback to my "liveliness". By now I feel somewhat guilty/out of character when I'm "too happy", as I fear I might annoy my social surroundings.
I like doing new things, up to a point where I dread any routine, but at the same time, I notice how not having routine makes me anxious. It feels like a trade-off between "stable but uncreative routine" and "creative/volatile let's try everything".
As you might notice: I'm a bit all over the place, which doesn't make a diagnosis very easy, especially once it starts factoring in my, rather unconventional, upbringing in two different languages across three different countries.