Dealing w childhood trauma

My mother and I don’t have a good relationship. Not really a relationship at all- she calls on my birthday and Christmas and that’s about it. I’ve seen a psychologist who went through a lot of things with me and I realised a lot of my “mother issues” come from traumatic events that occurred in my childhood.

My whole family thinks this is a load a crap and basically think I’m crazy for saying I had a “traumatic childhood” (when I actually said some events were traumatic for me).

My weight has always been a topic with my family, I’ve never been overweight but it’s the first thing my mother mentions when she sees me. Other basic things like my mother telling everyone, as I’m walking into my first day of year 7, that I had just gotten my first period (that was traumatic for me).

My sisters and mom talk about it and say how they have no idea what I’m talking about, my moms words being “I don’t know what the hell she’s going on about, ‘fucking childhood trauma’ what a load of rubbish”.

I am feeling really stuck because my feelings aren’t being acknowledged and my mother and sisters refuse to see how those things impacted me, and now discuss it behind my back. Has anyone had similar experiences to this, or any advice to give?