What is the deciding factor, if one side follows feelings, cant the other?(damn this is long)?

i have posted here a couple of times about what is going on. this is more of an update. a lil background. my gf of 2 years just got preggy again RIGHT AFTER an abortion. i guess its cuz we were stupid enough to have right after. last one i kind of talked her into but this one she wants to keep. i feel for her cuz i want to. she comes from a good home and i know i will be a good father but here are the quirks...ive been with her for 2 years, and i know she's a child herself. even preggy where a girl is supposed to just "shoot" and mature up, she isnt changing at all. she has no idea how she will take care of the child, how she will pay expenses and all that. she doesnt even know anything about insurance. ive been talking to her telling her that it will be super hard for both of us if we go thru with it. im not against abortion as it IS an option whether you like it or not. my gf feels like she can do it but i know her lifestyle and im SURE that she cant. truth be told..im not worried about her..im worried about the kid..if i could take the kid away from her, im sure i will take care of it a lot better than her. but i have stepped up and said i cant. not at this time..i dont even have a career path and im almost done in college.she on the other hand is a sopre. she knows nothing about life and i sincerely think that she shouldnt be allowed to have a child. maybe because she has a baby sister she plays with she thinks she can have one. her parents have 8 kids 5 in college...and they pay out of pocket and now she wants to dump this extra on them cuz she cant do it. selfish. my parents didnt raise me on tax payer dollars and hers didnt either...i dont want my child raised like that. ive talked to so many people but my feelings and brain are conflicting. ive been in a lot of trouble but i got into em cuz i was using feelings not brains. she would have never gotten pregnant if i had been using my brain apparently. she put up a good argument that instead of an abortion she can put it up for adoption. im against adoption (dont ask) but when i agreed and asked why she changed her mind she said its cuz her parents wont allow her to. now i wont just slander her only, i did a very messed up thing, i got fed up of how she wasnt thinking ahead not to talk of thinking at all and one day while i was a lil drunk i punched her right where scientifically the baby should be attached. but cuz i feel i want that kid...that baby could have punched harder...and i wept later on for the attempt. i love the girl but i treat her as my own baby, but now im just confused....i really wanna keep the kid but i believe i cant...and if i cant...SHE DEFINITELY cant...i work, i go to school and i live by myself also i depend HUGELY on my parents and their only rule is dont have a child, she on the other hand is the opposite. i love kids so i love mine but i absolutely do not want my baby to come into this world with a mom like that, with me like this, and at this time. im sorry to say but the girl is a dumb...and im one too for slipping up big time like this but i see a light at the end of the tunnel but she wont let me go to it....opinions people...opinions. and oh its not just as easy as saying "keep the kid" or "man-up" cuz if it were that easy then why is it that ive been trying to get this girl to grow into a woman for 2 years and she aint grown enough to think? im her bf, the closest to her other than her fam. but she treats me like a piece of **** and she admitted that she treats me worse than she treats her friends...i know it sounds bad but i pray every day and nite for God to take that kid away...i cant bring myself to punch her again cuz im still reeling from stooping that low before even tho im sure it didnt do nothing...im a decent guy but i wanna start using my brains now....cuz after this...i cant have another kid killed...HELP?