Where I'm at in the US, it doesn't even matter if you try to deny it. If your parents say they think you want to harm yourself because of what they've found, the cops can just haul you away. Someone can straight up call the cops and lie just to get you removed (happened to me) and they will involuntarily commit you based on someone else's word. Please be careful... the hospital is not a fun place, nor is it cheap. The first time I was committed I wasn't suicidal at all, and there was no evidence of me being so. When the cops found me I was sitting by a pond on the property, consequently barefoot because I had to flee my living space (roommate's boyfriend was trying to fight me). I had a tiny scratch on my arm, and stupidly admitted that I used to self harm as a young teen (13ish). I was naive at the time and was just trying to be truthful in answering the cop's questioning. They literally handcuffed me and threw me in the back of a van all because some asshole was pissed that I told his girlfriend he was a worthless cheater who assaulted me. Luckily the hospital staff was understanding and believed my story and did not admit me for an extended period so I was only stuck there for about 8hrs waiting for my release paperwork to be processed. Horrifying experience nonetheless. This was in 2014.