My boyfriend has the same specs and gets substantially better performance that that, around 70 FPS at 1440p ultrawide, so no, that's not normal.

Are you using the in-game FPS limiter? That's broken for me. Capping it at 72 FPS causes my game to run at around 30 (uncapped it runs at around 100). Something's causing your GPU usage to be that low-- the game will happily gobble up 99% usage on my PC, unless I have the framerate capped.