Haha, don't worry so much. OK, last things first: you're not OFFICIALLY boyfriend/girlfriend until the two of you have that conversation (the conversation where you decided you are officially bf/gf). This is the type of thing the girl usually brings up (because she's DYING to be your girlfriend right now, in case you don't know that part).
Have you called her? If not you need to. Because if you haven't, she is FREAKING OUT right now. Girls are silly like this. A million things are running through her head, and they're all absolutely nuts: should I have let him make out with me? Does he like me? He didn't call, maybe he doesn't like me. Maybe he think's I'm a slut now since I let him make out with me at the movies. I bet he never wants to see me again. I bet he told all his friends and they're all making fun of me now.
Seriously, this is the type of thing girls think up if you don't call the next day. You don't have to talk long; 5 minutes is enough. That's just enough to let her know you're interested still, and she was being crazy thinking those crazy things.
When it comes to "what is too much on the first date," that's really a matter of personal preference. Wherever you feel that line is is where that line is. This isn't something where a line is clearly drawn anywhere. How old are you, btw?
It's funny that you're this upset about making out, and your parents are worried about this leading to "other things." Regardless, the seedy details of your romantic life are none of their business. If you kissed her, or if you went all the way, or anything in between is none of their business. This is an area of your life where you have to establish your independance from your parents. If you feel comfortable talking to them about this that's fine, but intimate details like this aren't matters of public record. You can say, "I don't want to talk about this with you," and they should be able to respect that (I'm not guaranteeing that they WILL respect that, because parents can be nosy, but this is between you and this girl. If you don't want to tell your parents all the gritty details you shouldn't feel like you have to).
Now just relax, you did a good job.