Realize that winning at life does not mean that you beat others, but rather that you beat life itself. Realize that the only thing holding you back is life's grip on you that convinces you that you can't beat it. Break free of it. You're not seized by death, but by life.
Take care of yourself. Self-care is the most important, specifically the hard stuff. Clean your house, one room at a time. Shower, brush your hair and teeth, go for a walk outside, exercise, cook proper meals. You're not helping yourself at all by doing things you already do and enjoy. If you don't change yourself then the world won't change around you. Better yourself and everything else will follow closely in your wake.
Accept that happiness is a reward and not a gift. Accept that happiness is fleeting and you will have to continue to work for it if you want to keep getting it.
Listen to music you enjoy. Listen to music that matches your mood. Listen to music that inspires you. Trust me, it's important and you'll even enjoy it.
Be mature, but never grow up. Remember how to be a kid, but keep in mind that you have to be an adult sometimes. If you can decipher when each are appropriate then life will be significantly easier.
Get over it. It's harsh, but it's true. If you keep dwelling on things that happened in the past and are irreversible then how will you find the time to make sure the future turns out better?
Remember that you have plenty of time left, but that you have much control over how plenty. Remember you were born with enough time to do everything you want, but if you waste it then you'll lose it and can never get it back. Remember that if you enjoyed wasting the time then the time wasn't wasted and that you will die eventually.
Acknowledge that forgiveness is not a requirement. You do not have to forgive anyone who has hurt you, but people say it's nice.
Remind yourself that your health is more important than others' comfort. If someone feels better at your expense then they need to stop. Take care of yourself first, other people have their own coping mechanisms and they will get over it. You are your priority, no matter what.
Never forget that all problems have solutions. If you feel stuck, think. You'll eventually realize you know how to solve all of your problems. Never forget that solutions might not solve every problem at once, and you need to pick what's most important and what can be saved for later.
Accept that the future might be worse. Especially if you're in an environment you don't have full control over, things out of your hands could change for the worse. Accept that you can change most things however, and you can decide when things get better.
Know that there will come a time when you'll be forgotten forever and that will be so freeing. After you die, someone will think about you for the very last time and you'll be truly free. Nothing you do in life will last forever and soon everyone will have forgotten you ever existed, and it will be good.
Don't be superstitious. You'll worry more than you already do.
Realize that you won't ever get a positive answer unless you ask. No one will tell you yes unless you express that that's what you want to hear.
Listen to your doctors. Take your medications. Do your exercises. They studies for many years to tell you how to not die, listen to them. I promise they know more about how to help you than a random article online with no sources of sustenance.
Trust your gut. If you even stop to seriously consider something, it's probably at least a little bit true. If something is wrong, you will know it. You also know when that opinion is yours, or the one you've been tricked into believing is yours.
Think about the past. In moderation. Realize that the past is only as good as you remember it, and if you think it's better than the present then you will grow to despise the present. Realize that even if the past was better, you cannot go back and it passed for a reason.
Don't get back together with an ex. You broke up for a reason. Unless everything was a misunderstanding, in which case maybe. Even if you look back on your break up and think the reasons were foolish, remember that they hurt someone enough for you to break up. That will permanently damage your relationship, even if you try your hardest to fix everything.
Realize that you don't need to take advise from a random sixteen year old over the internet. Realize you can and should disregard any previous steps if you disagree.
Die knowing you lived.