Since I stopped drinking coffee in the morning, it feels like my day never starts

Facts. Morning coffee is just the start button.

I've tried quitting too, and 3 days seems a bit too early to judge. Caffeine withdrawal comes with headaches and lethargy and can last 1-2 weeks. If you really want to quit, try cutting down by just not drinking it after 2 PM, and you need to stick with that for 2 weeks before you can really tell. Being a zombie for 3 days is just the normal withdrawal phase.