how do you stay composed in 2's?

How it goes: Something triggers irritation, I get sucked into overthinking, I loose focus of the game. Why this happens for me significantly more in 2's is that theres much more stuff to potentially get irritated-over than 1's, with having 3 guys, instead of a single opponent.

My rank sums it up: I'm d3 in 1's, and currently C1 in 2's. I can keep up in low c3/gc1 lobbies (casual) as they match my skill in 1's, but that's only some of the time, as the irritation mechanism set in. Aka - my performance in d3 lobbies can sometimes be genuinely worse than c3.

I analysed myself for quite some time and concluded the main issue is emotions for me.

Anyone here that had this issue and overcame it?

My performance is governed by my momental state of mind wayy too much