Nobody warned me about the puppy blues

Got my dream puppy 3 weeks ago and honestly? I regret it. I know thats horrible to say but im exhausted. She bites constantly, wont sleep through the night, had 4 accidents today, and I havent left the house for more than an hour since I got her.

I feel trapped and guilty for feeling trapped. Everyone else seems to love every second of puppyhood and im just surviving.

Please tell me it gets better. I dont want to feel this way about a dog I waited years to get.