I'm too deep in the lies I told to a girl and I don't know what to do
Why are you deep in lies?
I'm afraid that I don't know how to act now.
You shouldn't lie to others. But it's never too late to be honest about something.
I'm pretty sad, but I don't know what to do.
You should tell the truth. You shouldn't be more concerned with the consequences than telling the truth. If you're really feeling remorseful, you should be honest and not continue to lie.