What should I do about my mum?

I think my mum might be emotionally abusing me, ever since I can remember she has always insulted me saying things like I am stupid, I don't deserve to live my life and other things which really hurt my feelings. It is really the small things her not telling me when we r going on holiday until just before the flight, not telling me that she is going on holiday with her boyfriend and is leaving be behind until just before. Then changing how long she is away for so I don't have enough clothes to wear. I just feel that she doesn't love me and am a disappointment to her it has really got to the point that i don't want to see her any more. Today alone she gas made me cry 12 times then she called me up tonights when i was at my dads accusing me of tacking her camera not even mentioning the fight we had earlier when I had left in tears. I am 13. And I don't know what to do I just can't cope any more