I completely understand your hesitancy to speak with your folks - I had a fear that my folks would no longer love me, think highly of me, and a host of other things that I used to avoid truthful speaking. What I want to say is that most all parents will be understanding and supportive of their children's issues, even if it takes them a while to get over the shock. As a parent, it's never a simple task to imagine my children going through misery, but they do. Speaking truthfully to your folks doesn't necessarily mean that you'll have to provide details. Preparing them with honest and carefully chosen words will help them to help you, if you ever seek to speak to them.
"Mom, Dad, I want to talk to you about something, but I want your promise that you will not interrupt me or stand in judgement.. If you can't agree to that, I'll speak to you about it at a later date." Nothing wrong with that.