What you did wrong was not weight training but following an unbalanced training regimen. No judgement there, I was guilty of the same when I was younger. I think younger/uninformed lifters tend to "ego lift" and focus on size over aspects of physical training. It is easy to fall into this trap when social media is heavily skewed toward steroid users.
Building physical strength is no sin. But you have to approach it from a health and not ego-centered perspective. This means lifting within your ability and with good form, practicing mobility exercises, and understanding the kinetic chain.
Developing a healthy body is a lifelong and rewarding journey. I recommend anyone starting their fitness journey to ground themselves in functional strength and physical therapy instead of the bro culture that is rampant in the fitness industry. I recommend the channels AthleanX and Kneesovertoesguy on YouTube if you want learn from people who teach safe and balanced approaches to strength.