Samsung Galaxy A5 - consume alot of data?

I own a Samsung Galaxy A5 and i am new to mobile data. I activated my service yesterday with 1GB of data. I browsed through a few website (google.ca, staples.ca) just to test network connection and found out that it has consumed closed to 20MB of data. Is this normal? Now i am thinking 1GB might not be enough, and the add-on data are so expensive!
Anyone has any idea how to reduce data consumption? I have already turned on the Data Saver and remove "Allow background data usage" for all my apps.

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