Fear is not going to help you in this instance. You need to make a plan, then the fear can dissipate and you can see what your next steps are. If you are in the U.S. Each county has services that can help you. The Red Cross provides housing assistance, so do many county organizations. There are job counsellors at the county too. From my leaving experience, it's rarely as bad as you are imagining. Deep breath, stop the fear, make a plan.
I moved more than a thousand miles away from where I grew up, to a place I didn't know a soul, or have any support system. I made it and you will too.