Question about dental fillings?

well i only ever had one cavity and had to get it filled like id say 2 months ago. btw i am a 17 year old female. i was so freaking scared out of my mind you dont understand. i went in there shaking. they probably would never give you laughing gas for a filling but they do numb you up with novacaine. this doesnt hurt much its only a tiny pinch :) but i have to say when they drill in the tooth its EXTREEEEEMELY cold. it was really uncomfortable for me because of how cold it was. but the actual filling doesnt hurt. actually none of it hurts. just expect a really cold sensation when they are using the drill. its nothing to worry about, and im a big baby with pain :P good luck!