Check Your Ego At The Door
The biggest killer of your results in the gym isn't a poor diet, inconsistency or whether you're taking a mountain of supplements or not.
Yes, these factors will have an influence your results....
But no-where near as much as your ego will.
Your ego is the enemy.
Your ego will have you swinging weight with momentum, ensuring you're not applying any form of progressive overload.
Your ego will have you neglecting dynamic stretching and foam rolling, as you'll convince yourself that you're not one of the people that needs to warm up or work on your mobility.
Your ego will have you constantly increasing the weight you're lifting, regardless of how much your form and range of motion suffer.
Regardless of whether you've been paying your gym dues for one week, two months or three years you've never eradicated your ego completely.
Leave your ego at the door.
Progressive overload, full range of motion and compound exercises.
These will get you where you want to be in terms of size and strength, there's no way around that.