I don't find cavities very painful but other people i know do. i can handle drinking cold water with a cavity i wonder why?

Everyone is different. You are at a disadvantage since your teeth are not letting you know they need treatment.

We are all wired differently. By not feeling stimuli that would say to you "Infection," you are not prompted to seek infection control. Please see a Dentist now. Infected teeth have been implicated in damage to other organ systems.

EVERYONE HAS DIFFERENT THRESHOLDS OF PAIN,YOU MAY NOT FEEL PAIN AS MUCH AS SOMEONE ELSE BUT IGNORING CAVITIES CAN LEAD TO LOSS OF YOUR TEETH AND EXPENSIVE TREATMENT THIS TIME YOUR PAIN WILL LEAD TO NO GAIN.

You may have a high pain threshold. You should see a dentist and practice preventive oral hygiene. You teeth should last you a lifetime, however, you do need to do your part, with brushing, flossing and getting regular checks. http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed & drugs