21F, 5'1", 154lbs,, struggling with weight, PCOS, low self-esteem, and feeling stuck. Any advice?

I’m 21, 5’1”, around 154lbs. The last time I was at what you’d call an “average” weight was about six years ago, back when I was mentally stable, active, and actually exercised regularly. Ever since then, my weight has slowly crept up and now I’m at a point where I don’t feel confident in my body at all.

I recently saw my gynecologist and was told my weight is contributing to my irregular periods, and with PCOS it’s going to be even harder to manage. Basically, I need to take care of myself more, not less.

I’ve tried going to the gym, but I get so self-conscious being surrounded by people who already look super fit. I know it shouldn’t matter, but my low self-esteem makes it really uncomfortable. On top of that, I’m a full-time student and I spend most days sitting at a desk until 3am studying. That usually leads to a McDonald’s run instead of anything remotely healthy.

I was told I’m eligible for things like Ozempic, but I’m honestly not a fan of going that route if I can help it.

I guess my question is: where do I start? What’s the best advice for someone who feels stuck in their body and in their mindset? I know “mindset is important,” I’ve tried inspo photos, but nothing motivates me. I just keep telling myself that because I’m short, I’ll look bad no matter what.