1. All life is valuable, especially human life. Every living thing deserves some level of respect and recognition, some level of love and care. For an individual, it doesn't matter what they look like, what they believe, or what they've done. Show some basic human decency and be a friend, regardless of your disagreements, vendettas, etc. In other words, love everyone like you might a brother or sister. If you come from a bad family... well, just imagine it like this: love them no matter what they do, no matter what they believe, and always. You don't have to like them, you don't have to agree with them. But they are still human. Treat them well, and take care of them, even if they don't return the favor. You'll make more friends that way, and who knows, you may even save a couple lives!
2. Taking one's life to end one's pain is to be betrayed by a lie. Though you may not see it personally, the people around you care about you. There are people who love and care for you. Ending your life puts the pain you feel on the shoulders of everyone around you. Your life has influenced others' in more ways than you know, and you still have potential. Don't let your dark side or your fears rule your life. Let the pain support your will to fight, not end it. More lives than yours depend on it.
3. Don't let your emotions blind you. I have personal experience with this, and I can tell you for a fact it will ruin your life and you won't even have seen it coming until it's already too late. Take every opportunity to slow down and think, to introspect. Look at the big picture, leave no stone unturned. Learn from the bad, and strengthen the good. Your mistakes and even your failures are in the past. Your beefs, frustrations, and wounds are prone to festering. Don't let them rule your life, and if they still manage to do so, work them out. Ultimately, be honest with yourself - don't focus on just the bad or just the good, look for the balance between them. You're not perfect, but you're not worthless, either. Finally, make sure your emotions aren't infecting you. Instead, rope them in, and utilize them to your advantage. Let them provide you with motivation to act on what's right, and to do the things you want to do with your life.