My mom refuses to get me a therapist/help.?

I have struggled with self harm (cutting and burning), bulimia, and what I suspect to be depression. I fear that I'm slowly becoming anorexic, and though I know I should stop and that I truly don't want this, I don't stop. Sometimes I'm not sure if I even can. A few months back, I told my mom about my self harm and how I'm working on recovering, so she knows there's something wrong. Yet when I told her about how I'm still struggling, having reoccurring suicidal thoughts, and that I feel I need professional help, she refused to send me to a therapist/psychologist/etc (though I've broached the topic multiple times). What am I supposed to do? I'm terrified of what I'm doing. I want help. Is it even legal for her to withhold me from getting mental health? Someone help me, please.