Well, you're in PR. Step back and look objectively -- will this particular spin work or not work?
I almost always would err on the side of total honesty, because these kinds of things can and do bite you in the butt. But if you were an intern doing, say, a lot of assignments given to more experienced people, well ... I guess you can't dodge the fact that you were an intern but you can talk about how your responsibilities were far greater than an average intern's.
In fact I think that is the stronger position. What title or level should someone your age have? Are the responsibilities you have taken on commesurate with someone your age, or with someone a bit older? If the title isn't impressive, but the work you have done while holding it is, well, that's what you need to emphasize. In bold.