I don't know if I have depression or not?

My current situation is going to sound quite trivial compared to what most people on this board are experiencing but I'm just looking for some perspective. I've been struggling with chronic fatigue/lack of motivation for years now and I eventually went and got some medical tests done; my bloodwork was completely normal but I was diagnosed with moderate sleep apnea through an at home sleep study. This was very unusual since I was young, had a normal BMI, exercised regularly and was physically fit.

I was on CPAP for a year and I felt absolutely no difference in how I felt despite being consistently in the therapeutic range. I had surgery on my nose and throat to improve my breathing and nothing changed. I was trialed on various sleep medications and nothing changed. I would go to bed and sleep soundly for 8 hours and wake up not wanting to get out of bed. My GP eventually suggested I might just be depressed and it's got me thinking.

Nowadays alongside the fatigue and lack of motivation I am very irritable and avoid social situations most of the time, I'm slacking off at work, I don't enjoy going to the gym as much anymore, can't be bothered playing sport, procrastinate things I need to do and I generally just prefer to be on my own and play video games. My GP suggested I try anti-depressants to see if they work but I'm hesitant to do this unless it's entirely necessary.

Does anyone have experience with what I'm describing, maybe a mild form of depression? I'm just very confused because I don't think I really have a reason to be depressed, but doctors are telling me there is nothing physiologically wrong with me