My first cavity, HELP?

so i haven't had a cavity in 15 years and now that im 16 im actually scared. i found out that i have a small one and now im thinking of a bunch of problems....the needle stabbing into my gum, what if theres not enough Novocain, the drill slicing my tooth, the anxiety, etc. And then the num feeling afterwards, im surprisingly scared considering the fact its my first cavity and i hate the num feeling and needles, how was your first cavity, was it not as bad as it seemed???