Am I lactose intolerant?

Ok, well my farting is bothering me. I don't want to go to school because of my farts. I am really sad and need help. I cry at launch time from people laughing at my farts. They keep coming the farts are really smelly REALLY. I was wondering if I am lactose intolerant. That would make my life because I had this problem for a long time. Heres why I think i am lactose intolerant. Everyday I go to school drinking milk. On the way to school my tummy grumbles everyday. At school it begins. And one more then. I ate cake last night (vanilla) and today morning milk and my farts were unbearable. Please help. Btw I just found out about "lactose intolerant". Please tell me if i am. If i am that will make me just cry of joy and no more suffering. I am crying right now typing this question