I am homless but attending school to get my diploma, my license has been suspended because of child support, i am not employed what can I do?

I am a 20 year old male attending Challenger secondary school in Spanaway Wa. I live from place to place have no job, and my license has ben suspended for failure to pay child support. How can I get my license back and lower my child support because I am unemployed? the mother of my son is with another man now and when I ask to see my son she says she has to ask him if I can see my son. This man also has domestic violence charges and dui's. I feel like I have no rights because I am homeless. Is there a way to get a lawyer and pay a minimal mount or possibly free? I know I owe and I want to support my son but when I called my case worker about my situation he said it is not his fault and basically to pay up. I am not a bad person but down on my luck, can you help me or point me in the direction of someone who can? please send a response to my moms e-mail address below..thank you.