Anxiety and booking flights

So, after (successfully) talking with my advisor about going home this summer, I was finally able to book my flight. I should be excited-- and I am-- but for some reason I always have a little bit of anxiety after booking a flight, especially a round-trip one. Should I have booked to stay longer? Shorter? I remember feeling the same thing immediately after booking for Christmas. Then, I only had 9 full days at home. I panicked, because I didn't feel like that'd be enough. But it was OK, when all was said and done. It felt like a long time. And this time, I'll be home for longer.

Larissa had some words of wisdom: "No time is long enough to visit."

And that's so true. Even if I were staying longer than I am, would that alleviate the anxiety about being away again that I feel now? Doubt it. Exchange students I've met here are away from home for four (4!) months, and yet they get just as homesick (if not moreso) than I do, knowing that I'm here for another 15, aside from the couple of weeks I get to sneak away for two times a year or so.

Speaking of exchange students, looks like another batch of friends I've made here is preparing to return home. It's a little depressing to think about, but I guess that's what it's like being abroad. People come and go. I remain, but soon enough I will follow suit.