I had mine sewn shut back in 1984 when I had my perm ileostomy done. I was pretty uncomfortable with mine too, but I was really malnourished and underweight, so I had no padding on my butt to sit on. Needless to say, I either laid down or stood up for a very long time. That was many years ago tho.
I'm sure others will be around here soon to advise and give you their take on it. Never hurts to check in with your surgeon/dr if you are feeling uncomfortable with it.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery