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Hello Itadakimasu:
I'm hearing a few things in your post...

1: You seem to feel very much alone.
2: You seem to feel very much unsupported.
3: You seem to have tried to share what you need and have felt unheard in that expression.

What I know about OCD could probably be written up on the head of a pin. I know slightly more about "voice hearing". One thing I do know is that "voice hearing" is probably far more common than is realized and that it often arises in conjunction with stressful situations: "Between 70 and 90 cent of people who hear voices do so following traumatic events."

You noted that this voice began approximately 7 months ago. Although it's possible that this voice arose of its own accord, it's also possible that it's related to a specific incident or cluster of incidents that occurred at that time. Something I sometimes recommend to people is a timeline. You can sketch one out very easily and mark on it, what happened and when it happened. In doing so, you may discover a pattern of behavior or be able to better identify why you responded as you did, when you did.

You also note that you've tried to share this with your therapist and feel unheard in that regard as well. One possibility might be for you to print out your post as you've written it, take it with you to your next appointment, and pass it over to your therapist to read.

It also might be helpful for you to explore some different ways that you can solicit your parent's support. Sometimes, writing can be more effective than talking. This might be something that's helpful to discuss with your therapist as well.

Lastly, the quote I included above comes from an article titled, How I Tamed the Voices in My Head. I suggest you read it. You may also enjoy this one: Redefining Hearing Voices. This article may also be helpful to you: Hearing Voices Network.

And, that's a start for you.