nipple piercings

Hey guys so I am really considering getting my nipples pierced but there is one reason that I haven't gotten it done yet. I want to know how noticeable/unnoticeable they are under clothes and bathing suits. The reason I am asking is that I don't want my parents to know about it. It's not that I am too young to get it (I am 20) it's just I live with them still and I just don't feel comfortable if they knew I had them pierced. Any advice is welcomed. Thanks! 💕