Asymmetrical nose, why is the left side of my nose so different from the right? (Photos)

Although the picture is not super clear, it appears that you have a bump on the bridge of your nose and some crookedness as well. Without looking inside, your described symptoms point towards a possible deviated septum. You don’t mention it, but it’s possible you have some swelling on the side walls of your nose which can be activated due to seasonal allergies and the environment. It would be wise to meet with a board certified plastic surgeon that specializes in Otolaryngology. Suggested treatment would be rhinoplasty, but first step should be to discuss with doctor about taking nasal steroids or possibly antihistamines.

Hi and welcome to our forum!
From your photos, I note a depression at the middle 1/3 of the nasal bridge, suggesting previous trauma. It is referred to as a "saddle nose deformity".
If a traumatic episode cannot be recalled, it may be the result of a natural delivery at birth at which time a slight displacement of a little button nose is not realized! If the septum is displaced or if there has been partial collapse of the nasal roof, nasal airway obstruction may occur.
A complete nasal examination is required.
Visit a board certified plastic surgeon for evaluation and discussion.
Best wishes...