Think about it this way:
The people who want to be around you will be happy near you anyway, and would be upset if you were hurt. The people who would be happy when you're hurt are the people you DON'T want to be happy. Making sure you're not hurt is what makes me happy
With the apologizing thing,
You don't need to apologize for everything you do. If you feel that you might have done something that could have offended someone, ask them if you did. Remember, you don't need to apologize as long as nobody is hurt.