Rugby is a tough game to play at a "pickup" level. There's a variant called "touch" that's pretty fun, but it's completely different from a normal game with contact.
I'd recommend sitting down and watching a highlight video which will give you a sense of why rugby is so exciting and dynamic. And then if you can find a local pub that shows some big international games, you can go watch with die-hard fans which is an awesome experience in itself.
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