I remember I picked Lemmy.world to create an account only because I had no idea what I was doing and it seemed like the only one which had merit at the time (I know how things work better now.) Now that I know how decentralization works I’ll probably open a new account on another server when I get time.
Finding a better therapist would help. Also finding the right people to vent to. Some people handle it better than others. You can try even saying, “hey, I’m not looking for advice, I just need to vent, would you mind being an ear?” at least that way you have their permission and they understand that they aren’t expected to fix whatever the issue is. Controlling who you vent to is also a good way to prevent venting to the wrong asshole who can’t shut their mouth.
I know you said no Journaling, but also consider a journal app on your phone or even just a Google docs. It’s a discreet way to vent briefly. I remember also taking a pen and a notebook and writing how I felt over the same line over and over so it wasn’t legible to anybody walking by. It’s likely something you’ll never read again and it’s about letting out the frustration more than anything.