1- Where did I come from?
You didn’t suddenly spring into existence the moment you were born.
You were happy in Heavenly Father’s presence, but He knew that you needed more in order to progress. You did not have a physical body like you do now, and you needed a chance to gain experience on your own—away from His presence, but with the ability to communicate with Him and receive help. So He sent you to Earth, hoping that you would return to Him and receive everything He has to offer you.
Before you were born, you lived with your Heavenly Father as one of His beloved spirit children. You knew and loved Him, and He knew and loved you.
Although you have forgotten your life before you were born, your Heavenly Father has not. He knows you and loves you. He wants you to come to know and love Him, too.
2- Why am I here on Earth?
You are not on Earth by accident. There is a purpose for your mortal existence. You are here to receive a physical body, gain experience, and develop divine attributes—like justice, mercy, and love.
God did not send you here without a plan. His plan is designed to bring you, and all His children, greater peace in this life—no matter what its trials—and eternal joy in the life to come. It is a plan of eternal salvation and happiness.
To partake of His plan, Heavenly Father invites you to:
Come to know and love Him and His Son, Jesus Christ.
Learn to love others as He loves them.
Learn to choose right over wrong.
Commit yourself to Him through ordinances such as baptism.
3- Where do we go after we die?
Death is not the end. Death is really a beginning—another step forward in Heavenly Father’s plan for His children.
Someday, like everyone else, your life on Earth will end and your physical body will die. But your spirit will not die. At the time of physical death, your spirit will go to the spirit world, where you will continue to learn and progress.
Death is a necessary step in your progression, just as your birth was. Sometime after your death, your spirit and your body will be reunited—never to be separated again. This is called resurrection, and it was made possible by the death and Resurrection of Jesus Christ.
4- Who am I?
You are a child of God—a daughter or son of your Heavenly Father, who knows you and loves you.
You lived with your Heavenly Father before you were born. He has known you and loved you from the beginning.
You are created in the image of God. Your Heavenly Father has created this world for you to learn, to grow, and to become like Him. Eventually, you can return to live with Him forever.
For this purpose, He has sent His Son into the world. Through the Savior, nothing can “separate us from the love of God” (Romans 8:39).
You are a child of God, whom He loves. This is your oldest, deepest, and most basic identity.
This is brief summary of what I believe, I hope it helps!