The number one symptom of diabetes is high blood sugar, and if you're worried about diabetes you should have a blood glucose test performed at the chemist (or pharmacy if you're in the USA like me).
Sore shoulders and hips could be a million possibilities, but it's probably something as simple as maybe you slept in an awkward position or maybe you've been looking at your phone too frequently with your head down (it happens to me).
Pain caused by diabetes is often caused by diabetic retinopathy which usually takes years of high blood sugar levels to present itself. The chances of you having it at 18 years old are astronomically low just like the chances of you having type 2 diabetes is also low (though it's becoming more common) at your age.
WITH THAT SAID, you have a family history of type 2 diabetes which puts you more at risk the older you get. If you're concerned, go speak with your doctor, but either way take this as an opportunity to keep your weight under control and make positive changes in your lifestyle (it only gets harder the older you get).