Don't be confused, there is a difference. You have to make the decision on if you're going to hit the gym to be a weight lifter or a bodybuilder.
Be clear on this, a body builder does not mean you're walking around with traps up to your ears and a gym bag full of needles and grilled chicken (Unless that's what you're into, no judgement here.) A body builder is chiefly concerned with the physique and proportions of his body. Forearms to calves, arms to thighs, etc. A weight lifter, on the other hand, is about lifting those heavy ass weights. Using 315lbs bench as a warmup.
The two are closely related, but different in approach. There's no way around lifting heavy. I hear people say "Light weight with a lot of reps" often, but I don't know about all that. Those people look the same year round. If you make the decision to be build your body for aesthetic appeal, take the scale out of the equation. Your weight and rep ranges should be fairly high, but focused on the tension. That sweet "squeeze" feeling that hurts so good. Also, you have to be smart enough to know your limits. 15 good lighter reps are better than 20 sloppy ones.
If you're a weight lifter, that's pretty much what you have to do. Lift heavy weights. You're going to need to put on more weight than you may like to. Keep in mind in your reps the old saying, "You're always one rep away from a PR and an injury." It's up to you to decide which one.