Should i ask this girl out?

ok i go to a school where the middle and highschool are almost conjoined and theres this girl in 7th grade (im in 9th) we’ve known each other litteraly our entire lives but within the last month or so we’ve ben talking alot and i got a txt from one of her friends and they said (reader’s digest version) either ask her out or dont waste her time but i fear that if we date it’ll A. ruin our friendship and/or B. ill get made fun of for going out with a 7th grader

so the question behind this is should i ask her out or not?

Thanks for your help.