Is it bad to drink milk when lactose intolerant?

I really need to grow taller so I have to drink milk two gles per day (1 when there's school because I'm lactose intolerant and I can't drink during the morning). I'm 15 yrs old and just 5 feet flat. I'm in desperation mode to grow much taller. I only started drinking milk like a few days ago. Milk makes me poop like 2-3 hours after drinking it.