When you say, "all chest exercises" what exercises do you do for the chest? This matters.
And, yes, there is the possibility that your pec minor/major, serratus, and subscapularis are over dominant. Go through the archives here and research exercises for the following:
infraspinatus - external rotation strength
teres minor - external rotation strength
mid traps - scapular retraction
rhomboids major/minor - scapular retraction
lower traps - scapular depression
Like most young guys, it's probably a safe bet that you push more than you pull (and your user id tells me you love to bench). You'll need to pull at least twice as much as you push.
Also learn to pull the scaps together and push them down when benching.
And don't forget to perform SMR on the pec minor. Also stretch the pec minor/major. They're most likely overactive.