Considering she's the strongest and most meta support right now, you're not really much of a support man.
Like right now, I'd rather have a Mercy main than a support player who can play every support but her in every single one of my matches.
I’m an ana main and when someone inevitably says “can we get a mercy instead of an Ana pls?” My response is always: yea I’d rather peel my own skin off with a potato peeler before I lock in mercy
If you're playing comp, yes. You should be willing to make compromises and doing things that you don't like or stepping out of your comfort zone to win instead of putting your ego and what you like to do first