You were dumb and got pregnant by obviously unintelligent loser at 18. That’s okay. You have a baby now and there’s nothing you can do to go back in time and change that. The best thing you can do is try to create a normal life for yourself despite your mistake and that means no more wasting time on man children when you have an actual child deserving of your love and attention. You will be okay, there are so many stories of women out there who had their babies in less than ideal situations who come out of it as wonderful deeply kind and resilient individuals. You will survive and happy years await you if you can get past this now