I am sure you will open up yet another can of worms with this question. However I am a born again Christian so I'll answer your question as one to whom you directed the question. I cannot tell you when you will die, no one can unless you choose to take your own life. I doubt that missing a church service will condemn you to eternal flames. Christianity is not about works, it is first and foremost about faith. If you believe that Jesus Christ is the only begotten Son of God (John 3:16) and you believe He is the Way, the Truth, and the Life and the only means that you can have fellowship with the Father; then you can and will be saved. Your actions should reflect your faith, but never allow man made works to replace that faith. As a Christian, I suspect the Holy Spirit is dealing with your heart and telling you it is time to make a decision. However, I doubt if He is telling you you will die soon. Please reflect on this and do not allow your conflicts with your parents, or the negative things you hear about Christianity hear affect your decision. Go with your heart. You do not have to be in church to be saved. You can receive the Lord Jesus as you sit at your computer.
If you have any questions about salvation, please go to the Biblical Christianity Forum on Curezone.org. There will be believers who will be happy to answer your questions.
Meanwhile, I am worried about your state of depression. I do understand that constant, unrelenting suffering will lead to depression. When you are in pain all the time it is almost impossible to to gain a positive attitude. It takes every bit of will power you can muster just to keep on going. But, you must try. Did you know that one of the worst side effects of antidepressant drugs like Zoloft and Prozac is the tendency to committ suicide after going off the drug? This problem seems to be especially acute with younger people. You are fighting a much larger battle than many, perhaps even yourself realize. How I pray you will release all this anger, fear and pain to the Lord and let Him deal with it in His way and time. But this is between you and God, no one, not I, your parents, believers and non-believers can force you to either accept or reject God; that decision is in your hands. Please take care of both your physical and emotional self. I am praying that your spiritual self will soon find the answers it is seeking.