Beginning your sentence with “I’m not gonna lie” is a lot like starting with “I’m not gonna punch you in the face.”
Oh, what’s that? You’re NOT going to punch me in the face? Why thank you, thank you for not punching me in the face. That’s very noble of you sir. Here I am, having a conversation with my friend, expecting a firm punch in the face, and yet you, out of basic human decency and goodness, have chosen not to.