There are many people who have used other people's possessions without getting their permission. You may have thought that you don't have to have their permission because they are your close friends or the things you used seemed insignificant. But strictly speaking, this not only is ill-mannered, but is deemed to be an act of stealing in the sight of God. If you have taken something without the owner's permission, you have to return it and apologize.
"All the ways of a man are clean in his own sight, but the Lord weighs the motives." (Proverbs 16:2)