I really don’t understand why you have children if you don’t want to raise them yourself
This is the sort of naive, black and white thinking you'd expect to hear from a childless teenager 
Surely if you've had children you would understand that no one can predict how they'll feel about being a mother until they've actually gone and become one?
I'm a SAHM, I planned it this way. I always wanted children. I have a very affectionate, loving mother whose life revolved around her children - so I assumed I'd be the same way. Turns out I was very, very wrong!
I love my DDs but I'm cracking up being at home every day. I really wanted to be a SAHM until they reached school age but I'm just not going to be able to do it. I'm so bored and lonely some days I could cry and it's not fair on them as I'm irritable and unhappy a lot of the time. I try insanely hard to keep my patience with them all day which inevitably means come evening I'll blow my top with DP over something minor or shout at the poor dog.
I want to "raise them" myself as you put it, but mentally I'm not suited to this SAH life. I've known this very early on but I've been plodding along trying to be some sort of martyr for over two years now. I think it's time to accept that, while having a mother who is happy to be at home is great for most children, being a miserable SAHM isn't ideal for anyone in the family.
Selfish? Perhaps... but I think it will ultimately benefit everyone if I go back to work. Shades of grey Cherry, shades of grey.