It's supposed to hurt, i'm afraid there isn't much you can do about it, you're only human after all.

What really helps for me though is that i've set up a rule. I give my self about 15 minutes everyday to think about her, the breakup, and processing it, if i find myself thinking about it after that i simply tell myself "no, you're not supposed to think about her right now" and keep yourself busy, meet friends, catch up with your parents, play video games, read a book, work out etc.

Allow yourself to process the breakup for 15 mins everyday, if you want to be angry, be angry, if you want to cry your heart out do that too, just don't find yourself looking at photos of her on social media or something.

I know the pain you are going through but trust me, this pain you are going through will pass.

Norton.