Is it normal to be so scared..

There are so many reasons that you're feeling this way. Have you kissed many people before? My first couple of kisses were the most awkward and terrifying experiences of my life. A common reason you could be feeling like this is that you don't think you are a good kisser. Worrying about it is gonna make you be bad, the only way to overcome this is to feel comfortable with the person and not worry about what your mouth is doing, just go with it :)

Try practicing with your pet dog or cat. Helped me out so much!

If you're nervous, your mouth is probably a little dry, which is good, because I'm pretty sure that the overly wet sloppy kiss is the most universally reviled. So go to it!