I have a knot on my shoulder the size of a strawberry. It is really bothering me. I've had it for over 5 years.

Watchful waiting. A shoulder mass that has not changed in size for five years and not causing any symptoms such as weakness, numbness, tingling, or decreased range of motion it is probably not a cause for concern. It could be a benign fatty tumor a cyst or something else. Since it is bother you it is worth having it evaluated by your physician.
Swelling. Have an Ultrasound done to confirm the cause of the swelling. If it has been the same for 5 years, it is unlikely to be dangerous. If it is bothering you, talk to your doctor about removal. All the best.