Please tell me it gets easier…

I’m a (28f) sahm and I have two children, 5 and 1 with another on the way. I feel no motivation, am consistently exhausted, I hate leaving my house, I feel like all I do is cook, clean and hear “mama, I need something” 1,000 times per day. I love my children and just bare the overwhelm by breathing and realizing I just have to keep going. But is this normal? My husband is extremely supportive and is an amazing father, he helps me with the kids when he’s not working, he is very present and works hard to provide for our family. We have a beautiful family, healthy children and have so many future plans. But why do I feel so dead inside? Do other people feel like a zombie during these years? Is there something wrong with me?