Lifters/ Gym Rats...step inside

I’m pretty active, I workout 5 times a week for about 2 hours at a shot for about 3 years now. I don’t use anything except walmart protein. I’ve tried a few supplements in a past and I feel that they work to an extent but always caused problems I didn’t want. It’s almost like I was getting big too fast and my body couldn’t take it so I end up with back problems or shoulder injuries that just set me back.
my weight never changes, I’m 5’10 175lbs. (maybe 180 on protein), my body fat changes like crazy but never my weight.