Been planning on quitting my part time job that I've had for a year as a hostess at a busy restaurant. I got the job to help me deal with social anxiety and it has helped alot. However, it still is a pretty stressful job and it's been difficult to do during the school year. I'm planning on quitting at the end of August but I have no idea how to bring it up to my manager. I  have a hard time telling people things as I'm a people pleaser. Our restaurant is going through some major changes in management and is having a hard time keeping servers and I know me quitting is going to take a toll on the host team as I have trained all the current hosts and have been the most experienced one taking on all the more difficult shifts.

Although I understand it is not my responsibility to worry about the future of the restaurant, it is giving me so much anxiety to quit. I need to quit for the sake of school and my mental health but I genuinely do not know how to quit this job without feeling guilty. I suffer from GAD and this is just making me ruminate like crazy. 

Any advice would really help! Preferably listed step by step so I can follow it easily. Thanks!