Am I supposed to play all 3 roles?

Want me to be a vanguard? I can do that!!!

A healer? Don't have to tell me twice :)

I need to be a duelist? No. I can't aim for anything.

I feel bad because theres been moments in my friend group where they wanted me as a duelist but I cant do it. I will have more deayhs than kills, by a long shot. I have tried 4-5 different duelists now, but the only one I could sorta do was Wolverine.