Help. / Serious topic.

A few months ago, I got sexually assualted. I'm underage and he isnt. Recently, my mum found out and told the police. Now, my mum has been telling me it was all my fault even though the police said it isnt. I'm really starting to believe it is my fault now because I was too afraid to say no and didnt defend myself. Any advice to stop these thoughts? Its making me feel suicidal and depressed.