The real question isn't how your parents see this, or how your friends see it, or even how you see it. The real question is this: How does God see it? What is His attitude toward what you are doing?
I'm sure if we were talking you'd probably tell me you don't really care what God thinks–but shouldn't that be your real concern? God made you, and someday you must stand before Him and give an account of your life. God also gave marriage to us, and He doesn't want us to take it lightly. This is why one of the Ten Commandments says, "You shall not commit adultery" (Exodus 20:14).
But God also loves you, and He knows what is best for you. One reason He gave marriage to us was to safeguard us from the dangers and unhappiness of this kind of relationship. You may feel happy right now, but one thing will always be missing–commitment. Without a firm commitment to each other–a commitment made before God and before others–your relationship will always be insecure and unstable. God has something better for you.
My prayer is that you will turn from your sins and open your heart to Jesus Christ. Jesus said, "I have come that they may have life, and have it to the full" (John 10:10). Life's greatest joy comes from knowing Him and following Him–and this joy can be yours, as you give your life to Christ.