Nobody in the gym really cares. We're all focused on ourself. If you're not strong, you gotta start somewhere. Use machines if you're embarrassed about people seeing how little weight you're moving. Just making sure that you're always progressing every time you go in there. I use an app called 'Strong' to keep track of it for me.
Every time you do a certain exercise, let's say chest press, make sure you're doing either more weight or more reps than the last time. if you had the machine set at 50lbs and you did 6 reps on the first set, 5 on the 2nd, and 4 on the 3rd, your goal the next time you do the chest press is to set it at 50lbs and do bare minimum of 7 reps, 5 reps, and 4 reps. Once you hit whatever reps you have in mind (3 sets of 8 reps is pretty standard), then you increase the weight.
Oh, and I'd weigh in on Friday morning. Monday morning is always going to be rough because of the weekend cheating and salt intake bumping up your weight from all the water you're holding onto. Eat clean throughout the week and loosen up on the weekend.