New rank system

This is so unfair!!!!!!! When u pick a sup as one of your role, you have 99% to be a support!!!!!!!!! For me, I only play mid and sup, THUS, I got support all day!!!!!!!!! This is so unfair!!!!!!!!!!!! I play like 50 ranks, I pick mid as my first role. BUT, I ONLY get 1 mid in 50 games!!!!!!!!