I want to move out but feel guilty
I've been wanting to move out of my mother's house for a while now. I had a sister was disabled for almost 9 yrs and passed away last year. My mother stayed home taking care of her and my nephew so I couldn't move out because I had to support them ( pay for rent, food, phone bill, etc). Now my mother is still not working and stays home taking care of my nephew who now doesn't have a mother. I'm 30 yrs old, single, no kids and my life has been work only. I want to move out and start living my life and plan for my future but I feel guilty. I still plan to help out my mother with money but I won't be able to pay for 2 rents ( hers and mine) and still save money. If I move out, I am not planning to bring my nephew with me. Sometimes I feel like I have helped enough and now is my turn to start living my life at 30 but other times I feel like I am being selfish for wanting to leave knowing that my mother doesn't have a chance to get a good job.
I don't know what to do.