求翻译：曾几何时，我一直在寻找友谊这种东西，但始终不明白友谊到底是什么，蓦然回首，才发现其实它一直在我的身边。是什么意思？

There was a such thing as I have been looking for friendship, but still don't understand what friendship is, when I look back, only to find it has been by my side.