Extreme thirst? Diabetic?

Nena
Do extreme thirst mean that I'm diabetic? I'm not dehydrated but I've been so thirsty lately & nothing helps! I know that I'm at high risk for becoming a diabetic so what were some signs that some of you ladies experienced before being diagnosed? My mom, grandmom, grandfather & aunt are diabetics. This has popped out of nowhere as well as horrible headaches!