Really nervous about my parents leaving?

I can't talk about it to anyone cuz I'm 17 and theyll all think I'm a loser who relys on their parents. This has never happened to me before me and my bro have been alone for 2 weeks every year since we were 13. I made lots of plans and was excited to be on our own. But now they're leaving tOnight and deep down inside I'm freaking out. WTF is going on, what do I do