Letting illegal citizen work in the us and health insurance......

Why is it that the our government help illegal citizen with health insurance such as medicaid, health plus but someone whos legal and working just trying to get any type of help or approval from the government cant.  Why dont the US help someone 1st thats paying taxes before they do immagrants.  Im all for helping people but why not help our citizens before doing for others. Its so hard for someone like myself that work fulltime and attends school fulltime to get any help from the government with my health insurance. I also believe we should  let all illegal citizens work, all they trying to do is survive and make a better living for themselves and family from the poverty they probably lived in.  And if the US let them work, we can charge them taxes and maybe, maybe that can help close the gap of financial debt we living in.  It can also help with the economy.