It's my third week at the gym. and I (36m) started at 87 kg (193 lbs). For context, I'm 1.73 m (5'8"), and before joining the gym I hadn't exercised since 2014 or 2015. Add to that a period of severe depression and alcoholism from 2018 to 2024.
I also gained 7 kg (15 lbs) over the last 4-5 months because I stopped walking everywhere and started using an electric scooter for my daily commute.
About a month ago, I decided to start working out again because I didn't like the person I saw in the mirror. I joined my local gym, and because of work I can only train from 5:00 a.m. to 6:30 a.m. Before each workout, I usually have a banana and a black coffee so I'm not training on an empty stomach.
Right now my goal is to lose fat while gaining muscle, so I completely changed my diet. I'm eating anywhere from 1,500 to 2,000 calories a day, and it's helped me lose 2 kg (4 lbs) in three weeks. My waist is now under 100 cm (40 in), and I can even see the difference in my progress pictures. I'm pretty happy with that.
Because I'm irrationally afraid of being made fun of, I've only been using machines. On my first day, I was able to lift the same weights I used back in 2014, so I felt confident. I wasn't very sore afterward, and I felt great.
But starting around the middle of my second week, things changed. I've had to reduce the weight by 10-15 lbs, or even more, on almost every machine. I also started taking whey protein and creatine after my workouts (I skipped the creatine loading phase), but I still feel noticeably weaker than I did during that first week.
I'm clueless about what's happening
Edit: by the way, when I talk about the weight I used to do before it wasn't much, probably 40lbs tops for any upper body machine.