When I was around 16 years old and started training with weights (just like what my father recommended me doing), and gradually increased the weights, there were joints and muscle groups in my body that just could not adjust. I had no way of improving triceps reasonably alongside the rest for pushups for example, and my right shoulder had the weirdest pain points whenever I moved weights with it beyond the initial smaller scales. So I eventually gave up.

Fast forward a decade, and my right shoulder still remembers these pains - I dunno if the weights caused it or some previous injury, but when I started training with my own weight, one sign that I was getting ahead of myself was that small pain. Now I can progress slower, but still I have to be very careful. Some of the exercises with heavy weights are just not natural for the body and simply exhaust/strain it more than it should. If you are experienced, you can work around these limitations, but I prefer body-weight exercises now.