child molested.

When I was 9 years old I was molested by my moms bother. He would touch me in the wrong places, tell me to sit in his lap and tell me how much he loved me and wanted to be with me... I never told anyone in my family this. I avoided him every chance I got. I am now 24 years old, till this day I have night mares and I'm haunted, i have trust issues, I have anxiety, and self consciousness. I have been in a relationship for 5 years and have not told my SO. our relationship isn't in a good place right now and I feel like I need to speak up about this matter for  him to understand me more and why I act the way I act..... I just don't know what to do. This haunts me everyday, I have nightmares and hear stories I cry cuz I know that pain... what should I do? Do you think that is why I act the way I act? I'm lost. I feel like I'm not worthy.
:( help please