low sex drive!

so I was wondering if this is normal, are the any of you going through the same thing...My husband ALWAYS WANTS TO HAVE SEX! hes always talking about it, I am always tired and rarely in the mood. I know i have to please my husband but I'm just not in the mood 5/7 days lol i am breastfeeding and i feel like all my attention goes to my kids even at night i have to wake up and feed my daughter. I feel bad at the same time ifeel like I'm being unfair because he works and provides and takes me out sometimes whenever we get the chance. We have three kids and it's hard. my youngest is 3 months old and as soon as I got the okay fro. my doctor he was like "ok pull those panties" lol and I'm like dude!! and to top it off last night he was trying to go down on me, I was asleep it was 2:30 mind that I had just gone to bed at 1:20 cause my son got hungry and "I'm the only parent that can feed him" --and I'm like "get off, im tiered, baby is about to wake up in a bit, dont try to kiss me" I mean I just feel so not into it and I told him I'm going to the living room to get some sleep and he was like no dont go...so then I'm like half asleep my eyes feel tired but in my head I'm thinking why cant I just please him...but I just couldn't find it in my self to be motivated lol then he says " I'ma eat you out and if your not turned on then I'll stop" and I'm like no get off so then he tells me "if your just going to tease me then get out" and I'm like how the hell am I teasing you if I'm fucking asleep!!??? and he says just cause your here...umm (WTF FUCKING DUCHE BAG) so immediately get up and I got tears running down my face BECAUSE 1. im tiered and 2.what a fucking dick... and then I proceed to take my self and my daughter to the living room....how inconsiderate of bim. he does this every fucking weekend in the morning hes, I feel forced...this has nothing to do with me not loving him or having no interest in him it's more like I'm just not in the mood.. idk what to do..and I dont know if I should be the one feeling guilty??