First of all you have to give a very good thinking in appling for Qatar Airways. Maybe there are some better options for you. Just don't hurry into this. Probably you should consider what people on this forum are talking about, they do have some informations that you don't have access to. At the end of the day it is your decision to make whaterever you want with your life, but you're allready 30 and you're gone be stuck there for sometime.
Good luck anyway!