I think this was your first real love. A breakup is really hard, especially when you’ve grown so deeply attached. You need time to heal, and you don’t really have a choice but to move on in order to continue forward.
Experience is the best teacher, so you should learn from this. You can use what you’ve gone through for the rest of your life.
You need to face tomorrow and consider the people around you who can help you get back up and start again, especially yourself. Start a new chapter in your life. Don’t let yourself stay stuck in the same place.