I Am Working Out Everyday, And Eating Healthy.... I Have

I am working out everyday, and eating healthy.... I have been doing this for about six months, I am 13, and I weigh 154lbs... Nothing is happening, I am not losing any weight, my doctor said that for my age, I need to weigh between 120-135. But she keeps telling me that I am healthy. I am so confused, and I don't know what to do.
Please help me!!!!!!!!