Complicated sex life

My husband and I have been together 6 years and we have 2 children. 2 and 5 months old. I’m still breastfeeding and our second threw me in for a loop hormones wise. I still don’t feel like myself. Just to give you a background on our situation. Well with both pregnancies he didn’t have to wait the 6 weeks after labor for us to have sex again because I didn’t tear and I didn’t make him wait. He’d ask and I didn’t tell him no because I was already made to feel bad about us only having sex 1-3 times a week. A long time ago we had sex daily, but since kids we don’t have sex as often. I mean I had sex with him Tuesday morning before work and he already was on my ass about it yesterday. Like give me a break. I am almost seeing it as a chore. My period is coming in 1-2 days and I’m begging for it to come. That’s how much I don’t want to have sex lately. Especially when he feels entitled to it because we’re married. I got so upset I told him we should divorce and he should go marry his match that will have sex with him when he wants. Because it’s not me and I won’t force myself for much longer. I just don’t know what to do anymore. He sent me a ted talk on how to keep our sex life alive but he didn’t even watch it himself. If he had he’d realize it was geared towards people that don’t expect sex often. It pissed me off even more. It makes me feel like I’m the broken one and I’m a grandma which he’s called me. It’s harmful to my self esteem. I want to just divorce at this point but it’s our only argument.