There is an infinite amount of work to do. You can’t get through it by working through your lunch breaks. When you have done so there will still be an infinite amount of work to do.
All of the things that you think you have to do are commitments that you’ve made, either explicitly or implicitly. Some commitments you will have made with yourself, others with other people – but at the fundamental level of your sense of responsibility, you have made the commitment with yourself.
If you want to have less to do, you have to renegotiate those commitments. Firstly with yourself, and then perhaps with other people. And then make fewer commitments in future.