I have ignored bowel movements since 5 years old, have had constipation since 15, and cannot feel urges now that i'm getting regular. what's going on?

Be seen: If you are chronically constipated you may be so backed up you have mega colon and do lose the sensation to go....You may just need a good cleaning out and then retraining your bowels to go regularly and normally. I guarantee you will need to make changes to your diet.

Sensitivity loss: Unfortunately, you are not alone. The sensors in your distal rectum became numb after you ignored them for so long. Now you need to work with a gastroenterologist on rehab. This may require a clean out, scheduled emptying for a year and something like Miralax for the same duration. You can reclaim this function but it will require assistance and work.