Last minute jitters?

I feel like I've been looking forward to this for so long, I've done so much planning, and I've never been actually nervous about it until now!

I'm one week from my start date, and on my last few days of work. Maybe it's just hitting me that I'm choosing this huge disruption in my life and I'm worried that it's gonna be hard to come back to my life after? Or I'm worried about not finishing and disappointing people? I'm generally not someone who's afraid of the unknown, and I love traveling solo. I'm so excited to go, and excited about taking a break from work, but just in the past few days I've been getting really anxious about the whole thing.

Has anyone else felt this way right before starting their thru?