I’m a single mom and my parents don’t want me to work

My son is a year old. He was in the nicu for 5 months after being born. I was the only one allowed to visit him so I did it all alone. While he was in there my mom made it about her and my stepdad told me I shouldn’t be crying at all because what’ll happen will happen. When he came home, I just graduated school and had to do internships to do so. They complained when I did the internships and always rushed me home. I got a job after graduating and they told me I should be putting my son first and that he isn’t their obligation. I quit due to an injury. While injured they didn’t want to watch him or help me much. TMI but they didn’t have the patience to help me out the bed and to the bathroom without hurting me and just left me to piss on myself. I was told to just work through the pain. (I dislocated my knee) My mom is going to school for her masters and cant help much because she has papers to do and internships coming up. My stepdad is a construction worker who’s not working right now but is going back soon. I suggested daycare and got barked at because of covid. He gets a SSI check of $600 a month for low birth weight (he’s 20 pounds now) and that’s all I have to live on. They claim I don’t HAVE to work because I get the check but I want my own apartment and can’t do so if they don’t want me to work. Am I supposed to sit at home, live on $600 a month and not work? I have a $40000 student loan to pay back. Cab rides for my sons doctor visits. Bills of my own. Diapers, wipes, baby clothes.

They do help me with him at times and watch him but they always let me know they don’t want to. I thank them for that but I hate when they take him when I don’t ask and throw it in my face that they didn’t have to. They’re hover grandparents and always tell me how to parent when I’m with him. “I’m cooking. Hold him until I’m finished and don’t let him on the floor” while he wants to crawl around and be a baby. So he cries because he can’t get down. If he bangs while playing he gets put in his playpen as a punishment. He cries when he goes in there because he thinks it’s a bad place and he’s done something wrong. The only place he can be free is our room and he gets tired of being in there. When I tell them they don’t have to help, im keeping him from them or I’m ungrateful. Am I ungrateful?