OP, it sounds like you had a very stressful, lonely childhood.
Suggestions that being in the midst of a terrible marriage, and emotionally ignored are not abuse, is utterly ridiculous.
Your response to your doorbell ringing is very telling.
You just don't want to be around her.
Own those emotions.
You are absolutely entitled to feel how you feel.
I think speaking to someone is a very good idea. You need to do this.
It's in your mother's own interest to belittle your memories and your feelings.
Don't concern yourself with her narrative.
Focus on how you feel and what you want.
I'm glad you have your partner's support.
Speaking to someone will give you the chance to full acknowledge how you feel.
You owe that to yourself, to fully express how you feel, in a safe environment.
The very best of luck to you.💐