Felt prepared, but seriously considering returning/rehoming.

I got my golden retriever puppy a few days ago, and I was excited for him and did tons of research before. My family has always had dogs of all ages literally since I was born. I always had responsibilities with them and loved every single one of the many throughout the years.

I had first thought about getting my own dog during college, but delayed for many reasons including making sure it was something I actually wanted and to make sure I had more time away from classes to give them attention. I did research on breeders, training, toys, tools; I tried to make sure I was as well prepared as physically and mentally possible before I committed to this. I found a reputable breeder, got prepared with all my toys and other helpful items, and then committed to getting him two months ago. Overall it had been a three year process of preparing for him.

He has since come home with me for the past three where im the only one. I feel absolutely horrible because everything he is doing is normal puppy stuff. He hasn't done anything wrong. He is very good and just needs lots of attention and enrichment.

I can't shake the feeling that ive made an absolutely massive mistake with him. He is doing well but I can't get myself to think anything but that im failing and failing him. I am hammering myself every day because how can I feel this way after doing so much preparing? I've done more looking into puppy blues and most everything is saying that this will pass, but it could take anywhere between days and months.

Coincidentally what wasn't part of my preparation with him is im starting a new job in a different city next week. I had a support system in my current location I could lean on to help take care of him when overwhelmed but that is going away. Im going to have to spend more time at work since im learning the new position. I had other things come up too that require my attention in the new city. This on the near horizon absolutely kills me too because it is a wrench in all the preparation I made for him.

I feel ashamed to even be thinking about removing or returning him, especially after only having him a couple days. And especially because he has basically been a saint. Im at a loss for what to do.

Any help or advice would be appreciated. I feel so lost. I've cried nonstop since last night and ive made myself sick over this.