If you don't want a power fantasy:
Play on a harder difficulty level, turn off aim assist, change the recoil to affect 'on camera' not 'on weapon'.
And/or turn off every element of the HUD, or maybe just leave a few parts for yourself. No more threat indicator noises/sounds, no more minimap, no more hit confirmation, no more knowing how much damage you're doing.
Not a panacea, there are still, imo, flaws with how the power scaling works, but those would take mods to address.
But yeah, try playing through on Very Hard, might feel a bit less like you're a overpowered super merc.