Why do i still have imaginary friends ?

sorry i deleted my last one because i diddent add much ... so iv had them since i was 5-6 im now 13 im a girl im happy i have grate friends who r real people but then i have the iaginary ones ! i have loads i have ones from tv programs like doctorwho and stuff then i have ones that iv made upbut most of them are from tv and for E.G doctorwho we like go traveling me pond and rory its awsome ! ... I CANT REALLY see them i just imagen then and pretend there really there but some times when im sad it feels like there hugging me !... ( no joke ) am i mental or just have a grate imagination ? iv always had that but like do i need help now im 13 and still have them ? im finding it so hard to let them go i triyed ones when i was 10 and i used to just wish they would come back and so every time i try i cant like do it =| ... and i also have a family a boy friend toby turner and a kid called toby who is 5 i have a huge house and a lovely car !and every now n then i go to the tardis and talk with the doctor and we go traveling around places like mars and save teh world ( my imagenary one ) ... do i need help ? x