Originally posted by xFLAMeHD
Psn is a more social network

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Xbox is more closed

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What are you on about? Xbox LIVE allows for 8 people cross-game chat. Video, voice and text chat with people on Messenger, and all Xbox 360-bundles ships with a microphone.
PlayStation does not feature any cross-game chat at all (except text messages), and you have to buy a microphone separately.
Xbox LIVE has Messenger, Facebook and Twitter integrated to the dashboard, and Microsoft just announced at E3 that YouTube will also be part of the new upcoming dashboard. And now that Microsoft is the new owner of Skype, I can't wait to see what awesome features they will bring to the Xbox 360!
To the OP: Welcome to Xbox

As other people already stated, to get used to it you should just play a lot, and it'll come naturally.