Then I developed pulsatile tinnitus in my early 30s, which means I can hear my heartbeat in my (right) ear at all hours of the day as well. When I tell people about it, I like to describe it like the heartbeat from Poe's The Tell-Tale Heart.
Developing pulsatile tinnitus really affected my mental health for a while, despite living my whole life with a constant buzzing and ringing in my ears. I couldn't get over the fact that there was now this loud whooshing sound in my right ear, 60+ times per second, and my doctors couldn't even tell me why after several MRIs. I thought I was going crazy, or that I'd developed some kind of brain tumor invisible to scans.
I don't have any great advice except to say that eventually (maybe six months to a year) my brain just adapted to the sound and I hardly ever think of it anymore. It's as much a part of my life as the buzzing and ringing I've had since I was a kid. It can be annoying when I'm trying to listen intently for something (my wife is a birder and it's hard to hear things she points out), but it thankfully doesn't affect my mental health anymore.