Don't be afraid to ask the people in your life for help. Have you talked to your parents? What about her parents? It also matters how far along your girlfriend is. It may be too late for an abortion, even if you would be willing to consider that option. Remember that adoption is also a possibility, and sometimes the adopting parents are willing to help pay for living expenses and medical bills. I don't know the details, but there are probably government programs to help you guys out. If you go to church, see if your church might be able to help. Apply for food stamps if you need to. Obviously, keep looking for a job, but beyond that, see if you can find odd jobs to do for your neighbors. Maybe you can mow lawns or babysit or use other skills you have while you look for a more permanent job. Most likely, the army will give you a job, but I can understand why you might be reluctant to take that route.
I am sorry about your situation. Good luck.