Feeling shaky, having nausea, feeling weakness and fatigue are one of several diabetes symptoms
. Having a family history of diabetes
also puts you at higher risk
than others. You're not going to get full answers to your concerns on the inet as we cannot diagnose you without seeing you.
Since you are a teenager, I suggest your parent/s have you fully evaluated by a doctor, not only just for diabetes, but also to rule out if some other health issue is brewing. Good luck.