Hi Taka, I really realized the importance of my family when I became a col lege student and started living on my own. I don't usually pay careful attention to the fact that I breathe. Likewise, I ('wasn't' is probably more natural) had not been aware of the importance of my family, because it had always been there.
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CliveI looked at this on the assumption that it represents spoken and informal English.Your assumption is right. Actually, it's a translation of the sentences originally written in Japanese, and the original is quite colloquial.
Clive
TakaAs I said above, it's a translationIf I had known you were translating, I wouldn't have bothered to comment. Clive's response was sufficient.