Mum doesn't understand self harm?

So I told my Mom I self harmed again, and she keeps making me feel worse with her reaction.
When saw saw my scars when I had first started, she threatened to tell my 2 friends whenever we argued. Eventually I had to tell them so she wouldn't, and they ditched me for being depressing and 'emo'. It's not entirely her fault, but I wish she hadn't frightened me into telling them.
Now, she thinks I'm doing it because its a trend. Which hurts a lot. I mean, I do it because I feel distanced from emotional pain when I cut, and feel like everythings going to be ok. But she almost triggered me last time, I have low enough self esteem as it is. I don't know how to convince her its not a trend, as I dont want to go into too much detail. [partly because I don't trust her not to tell anyone, partly as I don't want it to make her think I'm just an idiot teenager who makes a big deal of everything.] I have no idea of what to say... please help?
 
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