First time in the gym

I have a sedentary job. And at first it seemed very comfortable, but then I started to feel the effects. Back pain, weight gain.
The only cure was the gym and an active lifestyle
I remember the first time I went to the gym after a few years of this work.
It took me a long time to get ready for it... I watched a lot of videos... because the services of a trainer were expensive
There, I saw an exercise machine that I didn't know how to use. 
But not to look stupid, I decided to invent my own way of using it. 
Imagine that the whole gym was watching me. 
A trainer comes up and says: “This is a back trainer, and you... uh... seem to be doing an arm exercise.” Everyone was laughing, even me.
Then I realized that it would be better to pay for a coach's consultation... a few times... to learn everything... to get acquainted with the gym and then start working out.
It was positive for my health.