My 15-year-old Son Has Anxiety Because He Is Shorter Than

My 15-year-old son has anxiety because he is shorter than his peers. He is 5'0''. He tells me everyday he hates being short. Both his father and grandfather sprouted their junior year in high school. He's a freshman and is frustrated. I do not know what to tell him - he's also overly concerned about dying and what happens after we die. I talk with him constantly - to quell his worries - but unfortunately I do not have all the answers. Is this normal?