Extremely emotional

I've had a rough pregnancy and now im 35 weeks and feeling more emotional and depressed than ever. I cry all the time, feel overwhelmed, and hopeless. I dont know.how to accept the fact that im about to be a mom. I know me and my boyfriend are not going to last. Werr only together because I'm pregnant. He doesn't make me happy and mostly stresses me out more. My life feels completely hopeless and i feel like ive ruined any chance i had to be happy. I'm not ready to be a mom and don't want to be. Im really not sure what to do or how to deal with this. I feel so stressed out. Has anyone had feelings like this? I would love advice.