Hi- and welcome.
Alot of what you said resonated with me. Although my college degree is being put to good use (im a high school teacher) i also had to move back home after splitting with my ex as i lack the funds to rent by myself. Although i teach, its permanent part time, due to my crappy health, so i have no savings. I am blessed to have many friends, but i live along way from them, and while i make the effort to drive hours to see them, they rarely return the favour- busy lives etc. (They always manage to get me to come to them- they all live in the city and im almost in the country.) I have a car, but it was made in 1996- my senior students drive better and nicer cars than me. I feel like a total failure at 29yrs of age. BUT: i should look at the positives: I have somewhere to live (even though it cramps my style somewhat!) I have a job where I make my own money, be it a small paycheck, i still know i worked hard for it, I have people who care and i am certain you have people who care about you. Try and hold on to the small positives and take each day one step at a time. Are you trying to pursue a career that goes with your qualifications?
Keep us posted, welcome again and all the best-