There is nothing like an empty hotel gym at 5am. You can struggle. You can flatulate with impunity while your guts undulate like a bridge about to flip while on the treadmill. You can do low weight high reps on the dumbbells without 'bro do you even lift' condescension.
No matter what you want to improve, no matter how much of a novitiate you think you are, there is always a way to improve yourself in a manner which will not draw attention to yourself and your perceived shortcomings until your impostor syndrome has lessened.
Or dive right in and face it.