Hang in there!
I started an accelerated BSN program this May, and I was absolutely terrified during orientation! I was actually feeling pretty good until about ten minutes before the whole thing started... and I realized that I didn't know a soul in the room AND it was looking like more than I could handle. The workload, the class & clinical schedule, the unbelievable expectations - agh!
Being a semi-shy introvert myself, here's what I did: first day, during the orientation, I introduced myself (a bold move for shy me) to the girl next to me. Turns out she was as nervous as I was, also didn't know anyone, and became a good friend. Made myself do the same thing the next day and found another scared-but-nice friend. Most people are freaked out, too, and if nothing else, it's a common bond and a conversation starter
In regards to the other freaky aspects: yes, it does seem scary, especially during orientation. It's all new, and you haven't really established that routine yet. The first week or so of my program, all 50-something of us were walking around like deer in the headlights... but I promise you, it does get better. You start feeling less scared and more confident, and you get into that routine. Granted, it's still hard, and you'll feel like you live at school, but it will start to become more and more "normal". And one great benefit of all those hours put in at school: you make some terrific friends (you practically live with them!). We are all going through the same program, the same ups and downs, the same assignments, and at least at our school, we look out for each other, for the most part. Find a group of people you feel comfortable with and get a study group together!
You CAN make it work. These are going to be difficult classes, and already, I've shed some tears and felt the frustration of feeling like I only live to study and produce papers. But it is 100% worth it, and the benefits in the end vastly outweigh the negatives. Remember, it's only for a temporary period of time... and then you can take the NCLEX and claim your license and do what you love.