Hi Nyancats
I think from others, trying to explain what this is like is quite difficult because it's so different for everybody. What I think would be good is to say to yourself: "What is it that is actually scaring me about leaving?" Find the things that are scaring you and try to answer them, contest them as to justify your moving away. Knowing that you're making the right choice by moving away makes things more comfortable.
When i moved into my first home i remember being on the bus and thinking "If i don't pay the bills i'm going to be kicked out of my house and be made homeless" and just panicked about money for two weeks, making sure i had enough to save. That's what i felt it came down to; organising yourself in terms of finance and workload, and seeing what social activities you can do outside of that. After a while it just became normal, as long as you had enough money for bills you can do whatever you like. That was a nice feeling.
I also came to understand that one hour isn't really that far away when you have computers and phones to contact everyone at any time of the day, so it made the distance much shorter, and i don't think my parents have ever stopped worrying about me ever since i left!
So many people experience this kind of fear, and it's just something that seems to work itself out in the end. I won't say don't worry, because worrying means you are conscious of the necessities of independent living, just go for it and fumble your way through like pretty much everyone else has.
And if not, how long are you going to live at home for? Forever? Hehe