What 'activities' classify as sex?

My mom accidentally read some parts of my [detailed] journal and took me on a drive in order to be able to talk in private. She was completely hysterical because she thought I wasn't a virgin after reading stuff in my journal. I am a virgin. I intend to stay that way until I get married. It's just that I've done almost everything else...
She was saying, "It's not just sex; it's oral sex, groping, making out too."
Now, I don't know if I'm just that naive, but I don't think making out and groping are sex....they may lead to sex, but I don't think that if I'm making out with someone that I am having sex with him.
Can someone just please clarify to me what exactly goes under the category of sex and what does not?
Ex. Not sex - kissing. etc.

I am 18 if that helps any.....
Thanks.
 
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