I plan on applying for a LE job in the future once I'm old enough to apply. I really want to do this, and I feel I'd be successful in it. I'm just curious as to what your opinions of my adds are?

When I was 17, I had a bad day, and said something which was taken was taken seriously, as well as out of context. I had said "Wow, I want to die" because of the events which had occurred that day. I wasn't serious, nor did I mean anything by it. Nonetheless, the person who heard it called the Sheriff's Department and they took me down to a hospital under California WIC 5150 (involuntary 72 hour psychological evaluation for those who are possibly a danger to themselves/danger to others/gravely disabled. I was released after the 72 hours without being prescribed any medications. Beyond that, I've never been on medications in my life. I was simply having a rough patch at the time. 

I was discharged with a diagnosis of "Major Depression" -- which, sure I wasn't happy, but I'm not overall depressed all (or at least I don't feel it) the time, nor did I actually want or try to hurt myself. Anyway, I've been seeing a psychologist since, and she's knocked it down to dysthymia and it's something I actively work on in hopes of knocking it down to nothing. 

I'm wondering how much this will affect my chances of pursuing a career in law enforcement? Will they see it when I tell them and immediately say no, or will they still consider me and evaluate me to see if I'd be qualified?

I'm the first to admit I've made mistakes. At the time, I was just "young and dumb" really. I wasn't thinking about what I was saying at the time. Should I be as concerned about this as I am, or will this probably blow over? Going to a mental hospital looks really bad on paper, so it's very discouraging. Anyway, what are your views?