20 year old quitting her job tomorrow – super nervous and need hyping up :(

I’m a manager at a fast food chain and I know I’m going to be screwing some shifts up but I’m putting in my two weeks tomorrow. Can’t decide if I should lie and say I got a new job or if I should tell him the truth which is that my summer is just super busy and I don’t want to be working. He’s going to try to convince me to stay is the problem and I’m a pushoverI’m so nervous 🙁