I'm not going to stop a drunk girl from making out with me
What will you do with a drunk girl if she starts making out with you?
I am going to lie to her and tell her that I didn't get laid with her
You have a responsibility to not take advantage of a drunk person, as they are not legally able to give consent. Instead, make sure they get home safe and sound, that way you have a clear conscience.
I'm not some kind of angel, I didn't know she was drunk when we made out.
Next time, be more careful about asking for consent and smell their breathe to see if they are drunk. You should apologize for taking advantage of them and tell them it was an honest mistake.