I cut again after being 9 months clean

I broke... I wish I could express how much I wish I was happy. I cut my shoulder because I had a mental break down, I wasn’t myself and I was out of control. 9 months ago I was still getting over a year long relationship with someone who mentally abused me. 9 months later I cut because anxiety and everything balled up and I finally broke open, I don’t want my mom to disown me if she sees the cuts so I’m trying to hide them. This was last night.. I feel ashamed of myself but yet I feel so calmed down..