What it means by "out of sync" is that when you download the Satoshi (original) wallet, you download the entire "Blockchain," or every transaction in Bitcoin history. This is the reason why Bitcoin is decentralized - everyone has a copy of every transaction ever. By it saying "2 years" it means it has 2 years left of transactions to download (all the transactions that happened in the past two years). Even though I'm not sure why your Bitcoin address isn't showing (might be intended?), it's not really a good idea to use Bitcoin until the 25GB blockchain is downloaded, but you can get a wallet that doesn't download it called Multibit.