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Trolling is more like teasing, not attacking them. It's like when you have a sibling or a friend and they have a crush so you tease them. It's not bullying because you're not being mean or attacking them, you're just trying to irritate or embarrass them.
Sorry if this is kinda short but I'm a little bit brain dead right now
Trolling is much more common..and is mostly when a person just wants to start an argument, or just annoy people for their own amusement..
On the other hand, cyberbullying is a much more serious problem..it is pretty much what it is called, bad harassment online.