Hi there!
Well without a clinical evaluation it would be difficult to determine the issue in your case. Likely possibilities include fracture non-union/ mal-union, muscle/ nerve damage, inflammations, degenerations etc. I would suggest an evaluation by an orthopedician for an accurate diagnosis and appropriate management.
Hope this is helpful.
Take care!
even driving my car is painful, i go gym alot and im pretty restricted to what i can do, my muscle proportion is all off as i cant hit certain muscles ie, treceips as i cant straighten arm, i also get a swelling above elbow when in gym training