My Cookies suck!

I got a sugar cookie recipe off the internet yesterday. I don’t know what happened but.. they didn’t exactly brown when I baked them… it should’ve taken about 6-8 minutes to cook but they didn’t brown till 15 minutes later. They tasted so bad !! they were dry and white.. what did I do wrong? if it helps .. heres the recipe 1 1/2 cups sugar 2/3 cup shortening or butter* 2 eggs 2 tablespoons milk 1 teaspoon vanilla extract 3 1/4 cups flour 2 1/2 teaspoons baking powder 1/2 teaspoon salt Early in the day or the day before: In a large bowl cream the shortening and the sugar. Add the eggs, extract, and milk. In a medium bowl mix the dry ingredients with a wire whisk. Add the dry ingredients to the large bowl. Mix with mixer until well combined. With hands, shape dough into a ball. Wrap with plastic wrap and refrigerate for 2 to 3 hours.

Preheat oven to 400 degrees F. Lightly grease cookie sheets. Roll** half or 1/3 dough at a time, keep the rest refrigerated. For crisp cookies, roll dough, paper thin. For softer cookies, roll 1/8 “ to 1/4” thick. With floured cookie cutter, cut into shapes. Re-roll trimmings and cut.

Place cookies 1/2 inch apart on cookie sheets. Decorate* Bake 8 minutes or until very light brown. With pancake turner, remove cookies to racks; cool. Makes about 6 dozen cookies.

please tell me what I did wrong thanks