I think i have insomnia but im not sure, please help?

im about to be 13 and it has always taken me long to fall asleep. when im in a strange place it takes me a long time but also when im at home. im always the last one to fall asleep at sleepovers and i never thought anything of it until it got a little worse. it takes me anywhere from 30 minutes- 3 hours to fall asleep depending on how tired i am but it usually takes 1-2 hours. it is worst during the school year. i always will just lay in bed hoping for sleep to come, closing my eyes, and doing everything i can to help myself fall asleep but im always laying in bed with a million things running through my mind. my dad said it takes him about an hour to fall asleep so could insomnia be hereditary? please help D: