Chest Flys

Hey everyone :) I just had a quick question about chest flys. For those that have done this exercise, where do you feel it? I mostly feel it in my underarms, I'm not sure if that area is considered the chest or if I'm supposed to be feeling it elsewhere? I don't lift heavy for these since they're awkward (5-15 lbs per hand depending on how I feel). I honestly think I'm doing them wrong, even though I make sure my elbows are bent and wrists above elbow.