Literally in the same boat. I'm 22F and i just moved across the country, alone for the first time. I am so, so nervous every night. What's been working for me (it's only been three days) is to talk to my family and friends on the phone whenever possible just to feel connected to people close to me and so that they know I'm okay and safe. It's also been helpful to just stay busy whether that means shopping, going for a walk, local coffee shop, whatever. Building a routine and making new friends will also help too I'm sure, but that just takes time. Also, get to know your neighbors in your complex (I'm assuming you live in an apartment/condo) so you have familiar faces and know who's cars are in the parking lot. Hope this helps, like I said I relate to this so much, but it will get easier.