choose a good BB cream, which is a tinted lightweight cream available in many shades, at any drug store,that includes sunscreen and will add moisture and some color but will leave your freckles intact. Touch up your t-zone with a light dusting of powder and you're all set!
You really don't need it. It doesn't look good, and fools no one, especially the way young girls put on their makeup. Freckles and confidence in your appearance are much more important toward looking good.