Whats wrong with me,do i have a mental illness?

iim 13, have a very wierd mind.i dont think like others.all the time i think about very complex stuff,like why we exist and how life is just a whole bunch of opinions and paradoxes,it started like 4 years ago and it keeps getting worse .,somtimes i cant sleep cuz of it.and i actually think ive come up with the awnsers to some of these questions,but when i try to tell people i cant think of the words to put it in,or they just think im crazy.i cant even tell u right now about the intelligent things i think about cuz i cant word them right,i cant even tell a doctor.and this makes me so frustraited cuz i wanna just let it out and tell people but i cant .im also very creative and imaginitive and poetic.plz tell me if theres somthin wrong cuz its starting to make me deppressed