How do you do it ?

How do you become okay with realizing you picked the wrong baby father ? How do you become okay with being alone and realizing the relationship you were in took a mental and physical toll on your body? I try so hard to stay positive even more because I’m pregnant but I’m scared for what the future has to hold and I’m scared I won’t be enough to help financially for him. Idk what to do. I’m going myself and I’m still tryna figure out what is I wanna do. A part of me feels like a fuck up and a part of me feels responsible for not being able to give this boy a good role model as a father and someone he can call dad. I’m not looking forward to potentially battling for him. I’m not looking forward to making the relationship work anymore. I think I finally came to the realization that the right man would have never spoken to me or put his hands on me while I’m carrying his son in my womb the way my ex did. Did any of you moms or expecting moms go through this and how did you do it ? What kept you going and be positive ? Did you end up giving your baby his last name ? Does anyone know if I give my son his last name if it would be an issue in court if I wanted him all to myself ? I don’t want him there for him anymore. I feel like my dad or my brother would be a better role model than him. I just never wanted this to be my life where I would be the reason why my son has a void of a father. That makes me feel guilty...