C.N.
Dear J.,
It would be better for you to think about what to do if you two separate for a while. It would give you both the break that you need. ....and you (and he) did make your bed but you don't have to be punished for it the rest of your lives. Try to think that both of you are miserable and work it out for the best for both of you, infact the three of you.
Also, it is not unusual for a 19 year old father to not really know what to do with a baby, now think about it and apologize, and get on with your lives. Men are not women, Dads are not Moms especially when they are very young.
Go to see your minister, or a dear friend that is a bit older than you are. Pick someone who doesn't gossip. Every mother needs a mother, and she doesn't have to be your Mother, but can be a friend, but it would be very nice if she were older than you are and if she has been through 'stuff', then she will be wiser. O.K.?
Be sure to apologize and stop blaming, you both are at fault, and that is not against the law, you know. Do stop yelling and slamming, not good for the baby. She is having a bad enough time with untamed parents.
Sorry if I have hurt your feelings, but this is a serious matter, and I just told you what I think, it is not necessarily 'gospel', but it does come from experience. I am almost 76 years old.
C. N. Good luck and get on with some fun times in your lives. Baby needs fun times too.