Advice about life? Why is it so hard for the ones that wanna make it?

Hi, I am a 30 year old black woman I had a bad childhood and my life pretty much sucks I have two childrens that depend on me my family use me for my kind heart as well as friends and men. 4 yrs ago I was in a disturbing marriage came here to NYC went to school to get a medical istant certification I bn searching can't find a job. I hold a certified nurse aide lience can't find a job I have bn looking I went and post my resume on craiglist.. Put it like this I almost got killed. I went back to school I had to drop out a term now I can't go back til I pay what I owe them then I said I'm just gonna take any job I summit resume and applications but it seems like I'm invisible . I can't help to have a big heart and people just take advantage of that. They say blood is thicker than water thats a lie I live with my mom a person who hates me with a pion because I was born.. And I swear I'm trying so hard to move but something always happening I was in 2 car wreck last year the insurance company told me the thing it was a stage accident I just don't understand what is going on in my life. I wanna give up at time but I think about my kids. I just need a chance just one to get work as a medical istant r anything... I'm so puzzled