Dutifully learn the cover mechanic.
From Create Your Own Story
You race to a nearby CHEST-HIGH WALL and press A to slam your back to cover, unable to shake the feeling that you've somehow woken up in GEARS OF WAR. The EXPLOSIVE BARREL goes off behind you, shaking the door off its hinges.
AUSTRALIAN: Good! Now get out into the hallway- you'll need to pick up some thermo clips from that dead body on your way!
You do her bidding and pick them up, turning the strange, ammo-shaped things in your hands uncertainly.
YOU: Thermo... Clips?
AUSTRALIAN: A lot has changed since you've been gone, Shepard- Watch out! Mechs coming down the hallway!
Instincively slamming into cover, you pop out and fire at the HUMANOID ROBOT coming at you. Blasting away awkwardly, you quickly take out its LEGS before bringing it down with a solid HEADSHOT, watching it explode viscerally over the floor.
YOU (Increasingly frightened): This doesn't feel like an RPG! This doesn't feel like an RPG at all!
Do you: