Are Tiredness,constant Thirst And Frequent Urination Symptoms Of Diabetes?

Hello, I'm a 14 year old girl, and I just want to know if I have diabetes or not. The other day, I saw a commercial on TV with three symptoms of diabetes. They were: being tired all the time, constant thirst, and urninateing frequemtly. I know for a fact that I've been expiriencing the first two, but I'm not so sure about the third. Being cautious, I looked online and it also said the same thing, and an added symptom, tingly hands and feet, My right hand has been a having a tingly sensation, mostly my thumb, but I may just be being over cautious. I also told my friend that has diabetes about how tired and thirst I've been. I never once told him I thought I had diabetes, and he just told me about an hour ago that I need to go see a doctor to see if I have diabetes. I'm just so scared and I need answers. My parents won't take me to a doctor and they don't believe me either. They say its school that's been making me tired, but I just finished my Spring Break, and I was just as tired. Does it seem like I have diabetes, and if so, how can I make my parents believe me? I really just want the first question answered, but both would be much appreciated.

Thank you!