I'm scared I won't get my high school diploma

I'm failing school at this point I don't know what to do. I messed up majorly I'm trying to see if I can get my diploma and I doubt I will. So what do I do withy life if I get a GED? I'm scared then I won't get a job I enjoy and just be miserable for the rest of my life then again I probably deserve it but I still want some help or some kind of advice.