Never been a nail biter. I'm on the opposite spectrum and am OCD about the appearance of my nails.
Have you had any detrimental effects like infections since the persistent habit? I had a friend who used to chew his nails incessantly and I remember his thumb nail being practically non-existent.
Did it affect daily functions? I'm sure it didn't, but the aesthetics weren't the most appealing. However, I wouldn't worry because I have long nails and I get comments from girls saying they think it's gross/weird for a guy to have some manicured nails? Just can't win in this world. :/