I Can't remember my childhood?

HI guys,
I'm 18 and I can't remember anything before I was 12. I really don't remember a single thing. I don't know why. I had selective mutism up until I was 8 which is why the not remembering thing concerns me. Also, I have social anxiety disorder on top of that. Could they all be related?
I don't know what to do about his. Is something wrong with me?!

No, I wouldn't say there is anything "wrong" with u. I'm not a pcychologist or anything. Was there something traumatic that happened and ur mind put up a road block to protect u? (U don't have to ansewr that.) Maybe this would be good things to discuss with a trusted therapist.