Actually think through what you're doing before you do it.
Suicide is permanent, and your family and friends will have to deal with it for a life time. Always wondering where they went wrong, and why they didn't see the signs.
Even if it doesn't look like it now, your life will get better. I promise. It's not worth a few years in your life, where your life is basically being lived for you for you, to give up. To give away a life that will soon be yours, and only yours.
There is always someone there that you can talk to. Even if it is someone on here that you don't even know. It's better to talk to someone that doesn't know you all that well and isn't there experiencing everything with you. A fresh opinion may be all that you need.
Just know, that there are people you can confide in. Some people may even surprise you, and be someone you never thought of talking to.
Just live through these few troubles and you will be ready to face the world.