Proverbs 3:5-6 King James Version (KJV)

5 Trust in the Lord with all thine heart; and lean not unto thine own understanding.

6 In all thy ways acknowledge him, and he shall direct thy paths.

Hello brother/sister, God is closer than you think.
The first thing you need to do is to confess your known and unknown sins to God. Forgive yourself and forgive anyone that may have offended you.
Then commit your problems into the hand of God and ask God for direction.
Look for a bible believing church, report to the pastor of the church and open up to him/her. Have the pastor call your parents and have him plead with them. Have yourself mentored under the leadership of the church and study the word of God.
Have yourself placed on learning something that will fetch you little money to survive like Photography on campus. Your mind will be on going to school always while you study for another entry exam.
Know what you can handle academically. For example, If you are born to be a teacher, go for it. Just don't mind whatever what today says.
I want you to meditate on the bible verse that I have given to you.
It may be too simple but this is true.
I graduated from secondary school at the age of 23 in Nigeria. I attempted English several times because I refused to cheat. I eventually made it with C4 twice. First result cancelled by WAEC after 1 year of giving me my result. I was almost admitted for direct entry at Obafemi Awolowo University when this happened. I wept I got this admission but WAEC messed me up. I ended up as Okada rider for 11 years. I kept my hope in God. Withing that time I sat for my GCE again got my C4 without studying because I had it in me. Now my simple English is sharp, sound and polished.
Little did I know that God was preparing me for outside Nigeria. Now I live in the reality of my dream. Miraculously, I now study, work and live in one of the best first world countries.
God is preparing you for greatness.
Have you ever seen anyone in the bible that God used without testing them with something? Even Mary the mother of Jesus was surprised when visited by angel Gabriel. She asked How and Why me question? Examples: 1) Joseph/prison/prime minister. 2) Moses/burning bush/deliverer . 3) King David/shepherd/king e.t.c.
Your time of visitation just occurred. The way you handle it is what determines your failure and Success not what happened to you.
This is for everyone that is in one problem or the other. The higher the pressure the closer you are to your victory and the bigger your greatness.

Take this:
The purchasing power of =N=1000 note printed 10 years ago, that has been bartered, used in the market by traders all over Nigeria is the same value of =N=1000 note printed today. When you go to market to spend your old money. It carries the same value with the newest. Your life carries a value. The value remains shining and relevant in the market place of this world.
Please look at this picture, don't make this decision by quitting.The man below was almost there but he changed his mind at a very close range to his breakthrough. When you qiut is when time with resources are wasted.
Winners never quit. Your breakthrough is closer than you think. You turned 18 years by waiting from 18 seconds to 18 hours to 18 months now 18 years. Count your blessings. As long as you live. There are better days ahead.
Have faith in God and all will be well. Disassociate yourself from all unGodly friends. All is well.