I used actual white chocolate along with glucose and simple syrup in my recipe.
Did your recipe call for simple syrup?
Lauren Kitchens Youtube .... How to is great for people who are having problems
Make sure you watch the 'How NOT to make modelling chocolate' as well - suprising the number of people who have been given the wrong information and think its something they are doing!
Don't use simple syrup. Use either corn syrup or glucose.