Looks like you have gotten to a better place but in case you slip, I'd like to give some advice to think about. Am a parent of a guy and girls about your age. And having done some soul searching myself......
1)First don't disappear, all issues will follow and multiply. You aren't thinking this part through at all. If you did this you will never get on your feet only fall farther in the crack. Add to that the destruction of your parents, I don't think you want that responsiblity. Obviously they love you and are there for you which means you leaving will be quite a blow.
2)Normally it's not wise to leave a job until you have another but sometimes it is the healthy choice. Sounds like you were in another town where maybe you didn't want to be since you went back to your hometown. Well it's really tough to find a job when stuck somewhere. And sometimes it is the tough decision to walk that allows you to begin planning the next step. You now have the time to look for a new career.
3)The planning, sounds like that is what is missing. You have only applied to a few jobs so sounds like you are being very selective. I applaud your standards but sometimes we do have to take in between options to get us by while we continue to look for a more perfect situation. Maybe be more open about the bridge job. It looks better on resume to be working, it opens other doors, helps you network and gives you some cashflow. Maybe consider meeting with a career counselor and/or recruiter. So many jobs are only handled via these people, yours could be there. OR be looking to start some kind of small business (you have some cash) that could keep you busy, look good on resume, maybe grow into a fulltime business that will make you your own boss. You have the time and resources.
4) You are SO LUCKY to have the money, home, resources and supportive parents to help with the transition. Many people would kill for this. Use this time to start a life plan. As a parent, there is nothing more rewarding than helping your kid. When you are all grown up you leave a hole, it makes us feel good to be needed. So take their help, while making a plan for next step. Parents love plans and you will feel better with a plan.
5) You need to feel better about you. Be proactive. I would suggest: (A) Talk to your Dad about a finance plan. Take about a third of your money to (a) Pay off your car. You might want to leave in his name and insurance until you have a job but the minute you do convert it all. (b) Set up a money market checking account with the rest so you can begin to pay your own credit card bills etc in your name. Gives you control. (c) Any cards not in your name, give them back. (d) Have him continue to invest the remaining amount of money funneling profits to your checking account. (B) Find a cheap place to live and if you can get some roommates, old hometown friend, maybe someone you know just getting ready to graduate etc. Sometimes small older homes are cheaper than apartments. Look in an area not too close to parents but in area you like. Maybe close to a college if possible where you can rent rooms to students. Take the chance. You can't let waiting for the perfect job out there keep you from living. Find a job to hold you for now for cash, and find a home to call your own. Your whole perspective will change.
6) Girlfriend. (A) I have girls and I drill in them that they need a career so that they will always be financially independent. Your mate should be your partner emotionally and financially. Partners make better couples than dependent ones. Sounds from what you say that this girl comes from money. Sounds like she and maybe her family expect her to go from Daddy's wallet to yours. Not good.(B) On top of that you are in a difficult situation and it sounds like maybe you aren't getting the support and commitment you need from her, and maybe not from her family. We don't just "marry" a person, most times you marry them all. Do you have their full support in this tough time? Are they keeping it positive for you? You pushed her away because you can't provide for her ??? Not your job now or later. Sounds to me like you pushed because you don't have their support or maybe before you got hurt by lack of ? (C) I don't know if your girlfriend is in the place where your old job was or where you are living now, but if you left her behind then it sounds to me like you have been hanging on to something for six months. When you find a job, if it takes you to a town she is not, is she moving to where you end up? Trying to see where this is a healthy situation, sounds like two people living two separate lives. (D) Maybe you both need a break to figure out what both your plans are for yourselves, and if both of you are ready for a commitment for thicker or thin. If both you are committed then you need to make a solid plan to build a life together.
I wish you good luck on your interviews, hope you make a plan for yourself because it can change everything, and try to step back to see if you and this girl have the same long term goals. Life is full of changes and new starts. Maybe this is your time for a whole new fresh start, make it positive for you!