What is the most disturbing thing: "IF I offended anyone." There is no "if".
You did, Romney.
And the most disturbing thing: not what an adolescent did a long time ago. The most disturbing thing is the pride coming out of a potential candidate for the United States right now, in the present tense.
Several people on this and other conservative posts will rush to your defense on this one.
Not me. You need to express a little more humility on this than you have to date. Other pundits will comment that it happened 45 years ago. But you? You need to express some remorse.