New Job Blues

So I started my first job a week ago at this big office building downtown. It's supposed to be an awesome place with great benefits and stuff, but honestly? I'm struggling so much. Everyone is just buzzing around like they know what they're doing, while I feel lost in the crowd of cubicles and meetings. Like, did anyone get an orientation manual or something? I keep thinking back to my college days, where everything was more laid-back and you could just chill with friends between classes. Now it feels like there's no time for anything besides work. Plus, I have this weird thing where I've been forgetting to eat lunch because I get so caught up in my tasks or forget the time. I guess what I'm trying to say is, am I the only one who feels like an imposter? Is everyone else really that much more competent and confident than me? Or am I just overthinking everything? If anyone has any tips or words of encouragement, it would mean a lot. Thanks!