I have had both good and bad hospital experiences. If you find the idea of "voluntary means i can leave" reassuring, make sure you know the procedure. Where i live, the request to leave a voluntary stay requires a 72 hour hold. During that time they can petition to change you from voluntary to involuntary. So best case scenario, you would still be there 3 more days.
The biggest and best question to ask yourself about hospitalization is, "what do i hope to get out of it?" If you feel you will be unsafe if unsupervised, then it may be necessary. If your needs can be met by outpatient services, then that may be the better option. Make sure you look into the hospital programming. Will you have groups all day? Therapy? Classes? Or will you just be going even more crazy just staring at a wall?
I hope you can do the best thibg to keep yourself safe and well.