Don't let your pride, or anything else, keep you from making contact with your parents. You need their support right now, and hopefully they'll be wise enough to give it to you.
And I'm sure they will, because they obviously love you and care what happens to you. After all, why did they warn you about this person? It was because they loved you and cared about you, and they didn't want you to make a wrong decision. If they didn't love you, they wouldn't have cared what you did but they did care, and I'm sure they still do.
Let me be frank: One of the reasons you got into this situation is because of your stubbornness; you wouldn't listen to advice, and you were determined to go ahead and do what you wanted to do. But don't make the same mistake again! Don't let stubbornness keep you from doing what you need to do right now: Admit to your parents you were wrong and ask for their forgiveness and help.
But the most important advice I can give you is to turn to Christ and open your heart to Him. He loves you, and you need His forgiveness and His wisdom for your future. The Bible says, "You are forgiving and good, O Lord, abounding in love to all who call to you" (Psalm 86:5). With Christ there is always hope.