Doi really have attention deficit hyperactivity disorder, I think I have the symptoms,

hi im 15 and I think I have adhd, I have really bad grades, cant concentrate on my studies, theyre really really boring and I sometimes I just want to run away when I am forced to study. once I decide something in one day (like a schedule to study or something) I completely forget about it, or force myself not to think about it , I sometimes get hyper focused on somethin (like video games) once I returned from school (and was really really hungry) but got stuck to the computer, but only got up when I started get dizzy and all. whenever someone opens topic of my interest (like social studies) I get so over attentioned or something , I answer to things without the question is completed, and fidget. and I make wierd noises with my throat whenever im talking about a really intersting topic and brain seems to have accelated to 5000x. I am really forgetfull and irresponsible, iforget my lunch almost everyday , if I went to the market to buy milk and eggs , I end up buying eggs and forgetting the milk. I cant talk to people except my family, icant read long passages, I talk before I think. and my mother tells me whenever she took me to her office (in which I had to sit for hours quietly, I used to have tantrums so that she wont take me there) And I cant sleep at night without dreaming about my life, or how it would have been, and various other things, video games tv series and stuff ..for nearly an hour.

do I really have adhd or is this normal?????

You could have ADHD but it needs to be diagnosed by a doctor. In the meantime, increase your exercise as much as you can and try to eat a balanced diet on a regular schedule. The exercise should make you sleep better and that should be done on a regular schedule too.