I am so very sorry to hear of your plight. Not a good place to be at only 16 years old. I am no couselor, but I think you need a support group to participate in. One that allows you to express your feelings and to hear the stories of others who are going through similar things. I would suggest doing an online search or contacting a local church. They may be able to help you. I went through a similar period back in the 60's (yes, last century). I had convinced myself that life had no value and was not worth living. Never contemplated taking my life...too chicken!
I can only hope to encourage you with the words of Jesus: "Come to me, all you who labor and are heavy-laden...and I will give you rest". Also, the encouraging words of the prophet, Jeremiah: " I know the plans I have for you, says the Lord. Plans to prosper you and not to harm you".