Distance is a major factor when it comes to custody. 50/50 would be highly disruptive for this child and would definitely not work if you're breastfeeding. Also, you may have a child who doesn't "grow out of it" after the first few months.

I think both of your concerns could absolutely be used against you but I doubt it would actually affect custody. It certainly depends on your mental health issues, but the fact that you're addressing them and getting help is actually a good thing and shows your working on it. Can you support your child without child support? I think it would be important to show the court that you are responsible, have a job and a place to live. If you want custody, I'd suggest appearing like you could do it on your own.

You mentioned the father's mother was wanting him to pursue full custody. That's nice and all but that's because she wants to raise that baby.

You also mentioned you wouldn't mind if he had custody. That was slightly confusing but it sounds like you really want to create a plan that will work for both of you and that's great. But don't think that you don't deserve to be a mother because you're not as well off as he is.

I think you'll get sole custody and he'll get visitation. Just based on distance and breastfeeding.