The word “gospel” actually means good news.  Many people use it to say something is the truth.  They will tell you something, and say, “and that’s the gospel truth.”  As though that makes it more honest than if they just called it the truth.  The gospel as explained in the Bible is true.  But it means “The Good News.”
So, what is the good news it’s talking about?  The Bible says that “everyone has sinned and fallen short of God’s perfect standard” (Romans 3:23).  What that means is that we were all created by a loving God, who knows what is best for us.  Because He loves us, He doesn’t like to see us get hurt.  He knows that lying, stealing, and cheating hurt us and the people around us.  That is why God made laws like the 10 commandments.
He also knows that doing things we know are wrong cause us to feel guilty.  We do many things to deal with this guilt; like drinking, drugs, we blame our problems on other people, or we try to pretend we have done nothing wrong.  If we are willing to be honest with ourselves, we all can agree that we have sinned (done wrong things).  Some may have done it more than others, but we have all sinned.
The bad news is this; when we have done wrong things it actually causes us to feel far away from God, and we often don’t want Him around because we will feel worse.  The Bible says that “our sin has separated us from our God and even hidden His face from us” (Isaiah 59:2).  That is why you feel so alone when you do something wrong.  You are damaging your relationship with God and with others.
The even worse news is this; the Bible also says that “the penalty for sin is death, but the free gift of God is eternal life in Christ Jesus our Lord” (Romans 6:23).  In 1 Corinthians 15:1-11 the Bible explains that the gospel is this: Jesus died for our sins just like the Old Testament scriptures predicted He would, He was buried, and He rose from the dead just like the Old Testament scriptures said He would.  Jesus death burial and resurrection were predicted hundreds of years before they happened.  Hundreds of people saw Jesus alive after He died on the cross, and this death burial and resurrection are the heart of the gospel.
The GOOD NEWS is this; Jesus died for your sins, and for mine.  What do I do with that great news.  Rather than be offended or angry that the Bible says you have sinned, realize this; so have I, and so has everyone else on the planet.  We are all in the same situation.  We have sin and we have a God who loves us so much that He sent His one and only Son to die for our sins.  Romans 10:9-10 says, “if you confess with your mouth Jesus as Lord and believe in your heart that God raised Him from the dead you shall be saved; for with the heart a person believes, resulting in salvation and with the mouth he confesses, resulting in righteousness.”
God loves you, and He wants to save you from your sins so you can be set free from the burden of the guilt you feel over the wrong you have done, and also so you can have a restored relationship with Him and spend eternity in heaven.  But we must be willing to confess our sins; we cannot hide them from God or ourselves.
1 John 1:8-9 says, “If we say that we have no sin, we are deceiving ourselves and the truth is not in us, if we confess our sins, He is faithful and righteous to forgive us our sins and cleans us from all unrighteousness.”
So what do I do now?
Just pray (talk to God honestly) something like this:
Lord, I admit that I am a sinner.  I have done things that are wrong.  I have hurt myself and others with my actions.  I have broken my relationship with you.  I ask for my sins to be forgiven.  I confess that Jesus is Lord; He died on a cross for my sins and rose from the dead.  Please make me clean.  I want to know you.  Please come into my life, and wash me clean.  Lord, thank you for your love.  In Jesus name, Amen.