Feeling Invalidated: Dealing with Trauma and Frustration

I have so much built up trauma and when I try to talk about it to the people closest to me they just say that I’m just young and don’t know or understand what real trauma is and they always compare it to something nothing like my experience and I feel so invalidated about my personal experiences, I always feel so frustrated like wanting to scream me lungs out. I don’t know what to do.