I totally understand how you feel. Being on your own is absolutely terrifying and I wish every day I was braver, as I'm sure you do, too. The only way I can ever get through it is by trying to act tough and look intimidating and strong on the outside in the hopes that the phrase "fake it 'til you make it" will apply. I guess the only thing I can think of is to maybe try to combat the loneliness by going out with friends, double dating with a friend if you decide to start looking for a new significant other so you have someone familiar to fall back on if you feel panicky or like the date isn't going well, and if you're having trouble living alone then maybe look into a pet if you haven't already? Even if it's something as simple as a goldfish, just so long as you have some other living being there with you so that you don't feel so alone. And if a pet isn't possible, I find it always helps me to run a TV show in the background while I'm doing stuff, something light like a sitcom, just so it doesn't feel so lonely and still. As for going out into the world on your own, I try to prepare myself as best as possible and make sure I have the necessary items on hand for if something happens, like pepper spray for if someone tries to mug me and ibuprofen for if I feel sick and can't get home (since I'm dependent on public transportation to get places which isn't always the most convenient), as well as some comforting items like a soft, plush keychain of Stitch on my backpack that I sometimes squeeze when I have a panic attack or will rub his ears between my fingers. Or sometimes I'll open and close this locket I always wear around my neck, or play with the zipper on my boots. Just something comforting to distract me when times get tough and I'm stuck.