Hey,
I’m glad you felt comfortable enough to ask me about this. It means a lot to me.
I’m sure your cousin isn’t intending to be hurtful. They probably don’t realise that the comments are making you feel shitty. That said, I know it can be difficult to not let comments, like these, get to you.
Just remember you have nothing to feel bad about, not a single thing. It’s your body and it’s up to you whether you shave or not.
You could try talking to your cousin about it but I know, in some situations, that’ll only make the comments worse, and more relentless. It’s tricky to know what to suggest without knowing what type of person your cousin is.
I hope you don’t feel too bad about this though. I reckon it’s probably just thoughtless comments with no malicious intent behind them. :)