How can I keep going?

The only way to keep going is with God on my side. It just keeps getting harder and harder each day. We have our oldest son and his wife move in with is temporarily and it's hard. Besides the fact that there is not enough room for all of us and the financial responsibilities are tough. We really want to help as many others as we can since we have been helped by many through our addiction and stupidity.  I am trying my best to be a good person. We have tried this once before and we were taken advantage of. It ended badly. But, I just cannot allow them to live in their car. We are in a position to help others,  but when it seems like I do everything,  I'm tired. I work full-time, just finished getting my Bachelor's degree and I want to go back for my Master's,  but may have to put it off since I have no time and cannot do homework with all of them there.  Our granddaughter stays with us a lot when they are able to keep her.  I will make sure that she gets to see her parents. But why is it so hard for me? I'm trying to be a good person but feel like a doormat.  I don't want help, just someone to try and so things. Just try not to tear up our stuff. I'm just frustrated by everything.  I pray we can all make it until they find a place to live. Will continue this later...