Sounds like you could benefit from CBT (cognitive behavioral therapy). It basically focuses on replacing negative thoughts with positive ones or at least neutral ones and doing so repeatedly until your mind starts doing it automatically. It helped me at some point.

I’ve been to 7 different psychiatrists, therapists and psychologists. I’ll tell you something that helps, write out the major areas of what’s bothering you on a piece of paper, and then talk it out with your doctor. Two years ago when i was going regularly to a shrink i insisted on sitting across the room and taking my shoes off, and sitting in the lotus position on the couch since it was the only way I could sit still without being uncomfortable. Don’t be afraid. I wish you luck.

According to the law they can’t lock you up against your will. The only way they can do that is if you actively threaten to commit suicide or if you are causing harm to others and being violent. This is what my therapist told me. So you can tell them whatever you want. They’re not gonna laugh at you especially if they’re being paid to listen. There are medications out there that can actually help you. They have helped me when I had severe psychosis. You will definitely not be locked up, i know the fear – it is my worst nightmare but I have told my doctors everything even how I talked to voices and had hallucinations – and they prescribed me medication and psychotherapy. If you do it regularly it will help you. Don’t be nervous, maybe you have anxiety as well, they can help with that.