Can you get off a mortgage as a co-signer?

I am a co-signer on the house with my mother. She needed a co-signer at the time of purchase, so i co-signed so we would have a place to live. I want to move out because this is the worst decision I made. I am getting used for my money. I am 24 and want to move on with my b/f. If I leave she will not be able to afford the house, therefore she will get evicted. Will this effect my credit. How can I get off the house or cant I?