3 week old nursing constantly

My 3 week old constantly nurses throughout the day. She’s not fussy but gets mad if she doesn’t get the boob ASAP when she wants it lol. I don’t believe I have low supply, diapers are good and wet, she’s gaining nearly a pound a week. I just finished nursing my oldest in May and had an oversupply with her. Is this more or less a comfort thing? She refuses pacifiers. With my first I exclusively pumped for the first 8 weeks so I’m not familiar with what is normal newborn behavior when it comes to nursing. She doesn’t spit up a lot and she barely lets anyone else even hold her if she’s not in a deep sleep first. This momma is exhausted!