I felt the same way when I started, I just finished my first semester 2 weeks ago. It's not bad, a little nerve racking at time when teachers are testing you on your skills in lab and watching over you as you give an injection or flush a g-tube in clinicals. But it's not bad, my scariest moment was the first injection I gave on a real patient, I was so nervous. I was shaking afterward, but it hurts us more then them. But now I love giving injections, it's fun!
Don't be nervous, if this is what you want, you can do it! Study hard, but also take time for yourself. My first month of school I was a wreck, but then I got into the groove of things, and I love it. I can't wait to be a real RN! Study everyday, even if it's only 20-30 min., work on skills a lot, look over notes. The tests are not too bad, some teachers are tricky, and you might get frustrated at times, but that can happen with other classes also. If you got through all the pre-req's for nursing, you will do fine!
If you love, you will get through it! Study, get a good group of students to talk to and study with, keep a positive attitude and stay motivated!
Good luck! You will do great!