I can very relate. Yes, some is just the human condition. Your soul's journey imo. Maybe empathic (such a catch phrase lately everybody is an empath this and that). You feel so deeply, so get melancholic, depressed, sometimes happy & wanting to really feel life and fun and free. This to me is being human. But some of us get to the point we need help, seek help for depression or the mind not stopping. Then it becomes an illness that needs caring for. What my doctor explained to me, in my case, maybe others I'm not sure - the big hallmark for bipolar is the periods of less need for sleep.
It's hard for me to understand how every human is not experiencing it in this world. But they're not all experiencing it this way. Many function just fine in confines of society. Then again many more won't ever get dx because of many reasons...
Regarding auditory hallucinations, I just asked my doctor this last month. I was afraid to tell her though i've had them here & there for some time. And the paranoia I get... she said it is expected during hypo/mania. It's part of a busy mind, she said. If you're getting them overwhelmingly often, it could be something else of course. But you sound like you only had one or they are mild(?)