Ofcourse you should tell them. If you are thinking that this can break your family terms then let it be. You should be worried about your mental health. This case will affect your mental well being and inorder to save that you should say this your parents. This could be possible that they won’t believe you at that point don’t leave your hope and try again. If you won’t try then it will damage you from within so raise your voice and speak up for yourself.