Every time I lift my arm or use it for doing something I get a pain at the top of my arm/shoulder? Do you know what this is?

Sprain AC joint. Most likely its the ac sprain, which is a common condition. Other possibilities would be tendonitis/bursitis, if any trauma then a fx/strain etc.. Rarely a nerve problem from the neck. If it doesn't improve with nsaid, rest, ice/heat pads then see a doc.