I have a confession. 我要坦白。
I have something to confess.我有事要坦白。
I need to tell you something. 我有事必须告诉你。
I have a confession to make. 我要坦白。
I have a secret. 我有一个秘密。
I'm keeping a secret. 我有一个秘密。
I'll fill you in. 我要把一切都告诉你。
I'll tell you all about it. 我要告诉你一切。
I'll level with you. 我就直说吧。
I'll tell you frankly. 我坦白告诉你。