I have minor shoulder pain(in front) when i move my shoulder. it's been like this since i put objects on my shoulder, which was 3 weeks ago,any ideas?

See doc: Could be contusion,tendonitis or bursitis.Ibuprofen 200 mg three times aday with food,range of motion exercises,ice to shoulder 3 times a day for 20 minutes,if no improvement see your doc or sooner if worsens

Suspect rotator cuff: I suspect rotator cuff, but it may be something else. You can try heat but if it's not successful, it might be wise to get an evaluation.