This is going to be lengthy... but I will try to keep it as short as possible. Thank you in advance for reading.
My Dad's wife physically and emotionally abused me when I was a young child (age 5) for 2-3 years. It ended because I plucked up the courage to tell someone, which resulted in a family confrontation. In short: my Dad didn't believe me and told me I was lying.
20 years later, and that is still the case. As a child, I didn't want him to be angry or to lose a relationship with him, so, after a few years of us meeting up outside of the house - away from her - he persuaded me to visit the house again and spend time with her. I grew taller and bigger than her by then, and she has been nice as pie since. So, for the past decade or so, I've visited their house and pretended it's all fine.
It has never been mentioned or discussed. I play happy families to keep Dad happy. I hate confrontation and didn't want to upset anyone, so I'd try and be 'normal', even buying her birthday presents, only really to make Dad happy (it's awful to say that... but it is the truth).
I'm engaged to be married next year. With this comes my worst fear, merging my 'real life', and my pretend happy-families life as she has invited herself to the wedding. I don't have the courage to say no, as I want to avoid opening that can of worms, but as a result, I'm carrying the weight of that stress, knowing she will be in a room with my family, witnessing the biggest day of my life - it feels too much. The pain of my past, moving into my new future. (Eek... cheesy?)
Ever since my engagement in August last year, all I can think about is this. Past emotions have resurfaced with a vengeance. I have those childhood years on repeat in my head. Her telling me Dad doesn't love me, again and again, her smothering me in the night, the list goes on - (consciously skipping over the details).
I'm actively working on my mental health, and have seen therapists for my low self-esteem etc. I want to sort this, once and for all, as I know it's affecting my life A LOT. The only reason I put it to one side and pretended nothing happened, was for my Dad, to protect him and see him - however we don't really have a close relationship now, and putting him first, is harming me. I just want to avoid him, when he messages me, I feel sick because it reminds me I need to sort this out.
So... I have asked my Dad round to talk. Sideline issue: I never see my Dad without her there. Every plan, he invites her, when we speak on the phone, she's in the background - it's all getting too much for me.
Part of me feels I need to simply ask for 1:1 time with him, without her there, and hope that if I get that, I might feel better about the past ... (naive?) - or, a big bubbling part of me feels I need to be honest about the past. For my own sake, I need him to hear me say I wasn't lying, and it's killing me, pretending that I don't hurt over those years, still. That I don't want a relationship with her. However - I know this risks losing him. To make matters worse, she's recovering from cancer. There really is no ideal time to confront this issue, but now feels especially awful.
I'm so stuck. Any advice would really, really help, as I have no idea who I can talk to about this... and I need to figure out what to say.