Why are grown ups never responsible?

In every relationship I have been in I have had to be the responsible one. I wish I could do nothing and not care about the outcomes. The sad thing now is that there is a baby involved and I am still suppose to get a job, pay bills, do homework, take care of the kid, and support my husband’s inability to not spend money. Do you know how many times I am told what I have to do? What about yourself? What are you going to do? Why is it always me? When are you going to take responsibility and get motivated to do things so we can stop worrying about living?