It sounds like to me that it's not an issue of whether or not you love your baby, but that you feel you're not getting your due out of life, am I right?
I agree with the OP's that this sounds like depression (not a professional and don't claim to be one) more than parenting issues. I'm not a big fan of better living through chemistry, but depression, post partum or otherwise, is nothing to toy with. Please do consult a professional that you trust.
There's no reason anyone should have to simply "make do" for approximately 1/4 of their entire lifespan just because they had a baby! Maybe if you bring other aspects of your life to the place that you feel happy and satisfied, you may come to find satisfaction from raising your child as well.
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