You dont need to do 4 sets of each movement to grow your shoulder especially if you have an existing discomfort.
Start with a standing/seated overhead press and slowly progress with that movement so...
You can benefit from doing mixed grip and do it throughout the weights. Too many people use mixed grip for only their top sets and not during previous sets.
#1. Dont let anyone online diagnose you with something you probably dont have.
#2. Dont listen to anyone who listens/watches/follows athlean-x, dudes an actual idiot.
You need to stop having a negative connotation about yourself and have some self confidence. Dont bring yourself down by saying negative things about your hips or the amount of fat you have or having...
Waaaaay too much volume. Start with 2x12 reps with slow eccentrics until you can handle more volume that isnt 10 different tricep exercises. Easy way to treat it without medicine is to ice it a...
I would find a weight and a ROM that would work that you could work around pain free. Worst case scenario you should consult a medical professional.
Example would be the bar on a box above...