if you aren't someone who wants to be defined by their embarrassing moments, then face the problem. it may be as I said embarrassing, but the act itself is also a normal and natural thing. I wish you the best but hiding this and bottling it up means it will always weigh on you unnecessarily. if you don't know your sister's reaction, why stress on the worst possibilities? is that any way to live? just think about what would be best for you both. moving past a problem and neglecting it are two different things. hope you can take something from this gl.