I wouldn't kill myself. I would escape.
The first thing I would do is not brush my teeth for a long period of time. Like, really long (it would be worth it). After my teeth become sufficiently plaque-covered I would brush them, causing my gums to bleed excessively, and put on a wild grin. The people watching me on through the video camera would assume I bit my tongue off in an attempt to kill myself. When they come in to check, and attempt to give me medical assistance, I would bite the hand the fed me (or more likely tazed me when bored) by literally biting his hand. With guard number one subdued, I would use my psychic powers to knock out the guard number two, and loot his body (again, mouth). When guard number one recovered he would see his close-to-dead pal lying on the floor, giving me leverage to threaten him into releasing me (of course this is a plain faced lie; my mind can only harm those who are attempting to hurt me). After I get the straitjacket removed I would take out my shoegun (always stored in my sock) and shoot before he can call backup. I would then leave on my magical pony.
I had more, but I was writing too much so I ended it with a pony.