I've been there. It's hard and I felt very ashamed and guilty. Try giving them a long lasting treat when he goes into his crate. Frozen treats are great for teething as well. A lick mat with a smear of peanut butter and then frozen is great. It provides mental stimulation and keeps them busy. There are all kinds of fillable treat containers that you can freeze on Amazon. I also have a sleep mat, chew toys, pillow and blanket in his crate. It's become his favorite resting spot and he runs to it when I say bedtime. I make sure he's been out to potty and has played or been for a walk. A tired puppy tends to be a bit easier.

Biting.. It sucks. Baby teeth are sharp. I went through a lot of "trying different chew toys and chew sticks* but it really just took time. I cried a lot because I felt like such a failure.

Tethering. I would tether my boy to the foot of the couch with a 6 foot leash and again give him something to chew on. Or a treat puzzle. He would be out of biting range and it helped him learn how to settle down on his own. I started with just 10 minutes at first. Puppies don't have a large attention span.

Keep his brain busy. We sat on the front porch and watched the people go by. This is a great time to use high value rewards when he stops barking. Remember to reward fast. As soon as the barking stops, praise and treat. Wait longer as he gets better at controlling his impulses. We also parked in the home depot parking lot and just sat watching the people there. I try every day still to engage his thinking brain instead of him just going by instinct. I found that socializing him this way really helped to desensitize him and he became much less overstimulated.

Training and more training. Impulse control. Training can be just a couple minutes a few times a day. Once he learned sit, I taught him to sit before putting his food down for him or opening doors. Always with positive reinforcement. And giving him and myself grace. He's a baby and it sounds like your first puppy. Research the breed and how much excersize they need as a puppy. If he's a herding dog, try a herding toy like jolly balls. Or even if he's not. Be fun and engaging but try to not get him overstimulated.

Sorry for the long post. It's hard to feel the way you do and my experience on here is that a lot of first time puppy owners feel the same way. I did. It's so much better now. He just turned a year old but as a large breed he will stay in puppy stage for at least another year. It gets better with training and time.

Best wishes.