If you don't want to be found out, yes you do need to hide these things.
If your sister truly loves you, her acceptance will grow. But it may take a very long time if she remains ignorant. Do research here, so you can slowly educate her. Also remember that the more we accept ourselves, the easier it is for others to do so.
I didn't mean to attack or insult your sister, Joey. I was just attacking the toxic attitude that she is innocently perpetuating.
Robin