When do puppy blues get better?

I’ve had my almost 6mos puppy since August and most days I cant shake the feeling that she may be better off with a family that may want her more than I do. She has gotten better with biting but she’s still a lot. I do take her to puppy lessons and puppy day care a couple times a week but idk. I don’t think I could really rehome her but I hope these feelings go away soon