what's the point of secondary role

I only play mid even in normals 80% i only play fkin mid or troll pick for fun other roles just don't click it for me i have no experiene on them and i dont like them and i REFUSE to get any experience on them because i don't fkin like them why should i learn to play a role i don't like ? it gives no fking sense

putting me on any secondary will just put me on a huge disadvantage no matter what it is and tilts me since champion select unless i massively lucked out and my team carries me, yeah i played all roles before but not nearly as i played mid or as i'll ever play

why riot has to put on me on stupid secondary or autofill just so i have to "play it out" but really deep down i don't really know wtf am i doing, i am not having a good time and neither is my team when u deny me the only role i play