Playful biting or signs of aggression?

I have a 16 week old puppy that I’ve had since December 27th. She can be super sweet, I call her a Sour Patch kid because she can have her baby shark moods.

She’s great with people and other dogs – but I feel like with me she can get a little much. At first her teething wasn’t too bad but lately it’s getting worse, I find her pushing the limits on “nipping” she has punctured my skin a couple times and I’m not sure if this is normal or an early sign of aggression.

I’m really worried because the last thing I want to do is raise an aggressive dog, she is part Pit. I try to replace my hands with a toy and usually she’ll try to go over the toy back to my hand. I’ve done frozen carrots and she has a million toys good for teething but gets disinterested with them quickly. Should I be concerned?

EDIT – I also wanted to mention she is extremely well behaved everywhere but home. I take her to work with me almost everyday and she loves it and has a great day but at home she is completely different. I’ve taken her to my parents house and spent a couple nights there she was soooo well behaved and left her with my boyfriend and his family for a night and they adored her. I feel like there’s some disconnect between her and I? Or maybe my apartment? I don’t think she hates me, she loves sleeping with me and always tries to get my attention. Idk… first time puppy owner here lol.