We just entered (or re-entered) the world of puppy hood about a month ago when we brought our 8 week old Spoo home. Just wanted to encourage you with the bonding thing. It is a lot of work having a puppy. They are exhausting and, in many ways, a huge life disruption. Putting on top of that that it takes time to bond, it's the perfect recipe to feel the "puppy blues". I remembered feeling that way 5 years ago when we got our shih tzu puppy, so was prepared to work through it. I did have occasional bouts with "did we make a good choice" with our Spoo as well in the last month. But it has only been when I was frustrated. Now, a month later, I can see that myself, my husband, and my kids have all bonded to Dixie. Our shih tzu has accepted her. It will get better! It just takes time!
One thing that helped me bond with Dixie is training her. She has gone from completely ignoring me, to knowing sit, shake, down, working on speak and leash training... And teaching her eye contact with me has helped with all of that. There is also something bonding about her eyes looking at me and seeing the smart, obedient future dog we'll have if we don't give up. Really though, she is the smartest and easiest puppy we've ever had, but it still took time to bond and it's still hard work.
It will come. Give yourself and your pup time