If you were in a hurry, you should have used a lightweight wallet such as Electrum or MultiBit. Running a full node wallet such as Bitcoin Core requires you to sync the entire history of every bitcoin transaction that has ever occurred since 2009.
Now that you've already used an address from Bitcoin Core, you have a few options, but they all either require a bit of technical knowledge or a bit of risk:
You could dump the private key of the address that you used from Bitcoin Core and import it into either Electrum or MultiBit.
You could create a brand new blockchain.info wallet by importing the Bitcoin Core wallet using the
https://blockchain.info/wallet/import-wallet webpage.