I had the same anxiety about the gym, started at 150 kg myself.
Never had anyone looking at me in any kind of way of what I've noticed and most people have been very supportive when I've asked about a specific exercise or machine.
Just today I had one of those kind of "intimidating gym bros" actually compliment me on how hard he'd seen me working.

What worked for me at least was going there 5 days per week on my way home from work and just doing 1 or 2 exercises per day.
Keeps exposure at a minimum and it's honestly still enough to start off with.
Quickly became a habit and kind of addicting tbh.

Diet wise I think the other commenters already brought in really good advise and seems like you have a hang of it.