Can I vent ?

I just need to let it out somewhere, I feel like I have absolutely no support from my SO when it comes to raising our son. I honestly feel like a single mother. I understand he works 12+ hours a day sometimes plus has two kids with his ex that he has to spend time with and his son he takes to hockey like 4-5 days in the week. I cry multiple times to him that I need help and would be nice to have 30 min to myself for a relaxing bath or something which never happens.

Anytime I try and talk to him about my frustration he has an excuse and says something smart about that’s why I’m off on maternity leave to take care of him. Makes it seem like he doesn’t care. I’ve tried breastfeeding since day one and was a really rocky start especially because my csection recovery was horrible. Now my baby gets frustrated when he nurses because my milk supply is extremely low.

Everyone tells me to pump more but I literally have no time, every time he falls asleep and I think I’ll be able to get in a good pumping session he wakes up like 5 minutes into it and starts freaking out.. I’m so frustrated and I feel like I’m failing because my goal has always been to breastfeed. I cry almost everyday from it and I don’t know what else to do. 😭 I tried calling my SO to see when he would be gone from work to see if he could come a little earlier so I can pump and and he says no that I’m the one that wants to pump and he has work to do. I cried and said I’m frustrated and feel like a failure and that I have no support from him and he just says he can’t have the conversation at that moment cause he was working. I don’t know what else to do besides give up. My son drinks 7 oz every 3 hours and I can barely produce 3 oz😭😭