I’ve convinced myself that I cannot play comp unless I win a warmup game of unranked first

Doom, Ball, Winton, Zen and Mei, Sym and Torb for some reason. Coming up on 1,000 hours played and 80% of the time playing dps, I still can’t put sym or torb to good use. And Doom, Ball and Monkey are just too high-skill for me to play and Zen is just iffy for me