Does pinching my nostrils together damage my nostrils and/or make my nostrils more flared? (Photo)

My nostrils flare upwards and outwards making my nose look like an upside down triangle. I am 18 now and ever since I was 12 I have been pinching my nostrils together trying to reduce my nostrils flaring. My mom told me that if I kept pinching my nostrils that I would damage the cartilage and cause it to rebuild bigger and more flared. Is this true? I am worried that I have caused the opposite result of what I was trying to accomplish. DOES PINCHING NOSTRILS CAUSE DAMAGE IT/ MAKE NOSTRILS BIGGER