Will not doing horizontal pressing/pulling movements lead to imbalance?

I have been doing very little horizontal pressing and pulling movements. I have been training a lot of clean and presses and dips for pressing, and pullups/chinups for pulling. I have been getting some pain in the front of my left shoulder though and I am wondering if it could be because of the lack of horizontal movements. I don't have a bench, but would throwing in weighted pushups and bar rows be a good idea?