It's not exactly something you can admit out loud in real life is it 
I don't have any advice but just wanted to say you're not a bad person, there is nothing wrong with having doubts and fears and you're not alone.
I'm 31 weeks pregnant with ds4. Unplanned pregnancy and I didn't find out until after ex and I split up. I put all my symptoms down to the emotion of the time and wasn't having periods as I was still breastfeeding ds3. It was a total shock.
And it still hasn't really sunk in. As guilty and as awful as I feel for saying it and thinking it, I haven't bonded with this baby. I haven't dragged out the Doppler like I did with ds3 to eagerly listen to his heartbeat every day, I haven't lay in bed at night poking my stomach to make him move, or imagined what he will look like. I haven't bought a single nappy or outfit and am willing the time to slow down and stop flying by at warp speed.
Although my situation isn't perfect at the moment, I think I have a good balance. My ds1&2 are 10 and 8 and adore ds3 (17 months). They are I dependant enough to do most things for themselves, they help me with ds3. They go to their dads half the week and I get my delicious toddler all to myself. He's not a good sleeper but it doesn't matter because I can nap with him during the day. It just works. We are a little unit and I like it this way.
But, it's all going to change. It will be so much more work, I will be exhausted, I will have to share my time even more. I don't want to do it. I planned to go to work next year, I planned to learn to drive, I planned to do so many things.
I just don't want to do it.