For most Chinese, it is not easy to say "I love you", even to our parents, no matter how much we love them. The Chinese prefer to put their love in the heart rather than say the words. Some of us may think it is not important to express our love. Only if our parents can feel our love and believe we love them, that is enough.
Try to think about this question in another way. Do you want to hear your parents say they love you? If they say so, how will you feel? Won't you feel happy and very warm? Sure you will. And your parents will feel the same if you tell them you love them. Parents never expect their children to do many things for them. They are so easy to be satisfied. Why not try to say "I love you" to them one day? It's not a really difficult thing. And you will see how surprised and happy they are!