Hey Emma, welcome.
I´m very sorry to hear about your experience.
My regular blackouts started at university and looking back it is easy to see that all the warning signs were there. Although I got to my first AA meeting at 21, it was another 16 years before I finally got sober. You seem to be a little more switched on than I was at 20!
You are very, very wise to have sought out SR. We all get it & no one will judge you. Stick around & keep posting.
Max