Why do I get pain in the left side of my nose/left nostril when I breathe and how can I fix it? (Photo)

when i breathe through my nose i get a pain that feels kind of cold inside the upper left side of my nose. but when I push the soft bone part of my nose to the left and breathe, the pain goes away and it feels a lot more comfortable to breathe through my left nostril. the pain is where the hard bone of my nose is on the left side. (upper left side) This has given me head aches on my left side if i breathe through my nose too much.