My life is so uninteresting right now. What should I do?

I'm currently in high school. My life is a routine of waking up, going to school, going home, doing homework, and going to bed. I try to make it interesting by doing things I've never done before, but I end up being filled with anxiety and depression. There's more to my unhappiness and dissatisfaction with life, but I won't state them at this moment in fear that you guys will simply disregard this as a rambling on and on kind of thing. It's just that recently I tried looking for my dad's revolver just to shoot myself and get it over with but (fortunately) I couldn't find it. I'm seriously scaring myself. I've taken a bunch of my mom's anti-depressants before but have never overdosed. I haven't taken any in about two weeks and don't plan on doing so again, but I'm afraid that moment of utter loneliness and not-knowing-where-I'm-going-in-life will emerge again and I will finally follow through with the spontaneous plan.