Your ability to adapt to the situation you're in is what makes you a good gamer. That being said, dodging/trolling every time you get autofilled just shows you're incapable of playing the game to its fullest potential and are overall more of a liability and hindrance to your team than anything. You will never be able to play your main role and/or main champion every game, and that is just something you have to accept and get used to. Make a conscious effort to better yourself as a gamer or don't complain, cause you're unwillingness to learn is what put you in this situation.
Take me, for example. I'm a Jhin/ADC main. Do I play Jhin/ADC every game? No. When I'm support, I play Janna. When I'm jungle, I play Kindred. When I'm mid, I play Aurelion Sol. When I'm top, I play Ornn. And I have several back up champions for every role in the event that my pick gets taken or banned. The fact that I can't play Jhin/ADC every game is something that I grasped very early on, because its literally impossible for me to do that if I want to better myself in this game.