@simrin-- My husband had a colostomy stoma surgery several years ago as well. He might have the option of reversing it in the near future and he's not yer decided on that. When people ask him about the colostomy and the colostomy bag though, he always says that he wish he could change where the opening (stoma) was made.
I think this is the main issue for most people after a colostomy surgery. Usually, a nurse will discuss where the opening should be with the patient before a surgery. But if it is an emergency surgery, there might not be time for that. That's what happened to my husband and his stoma is too high up, right around the waistline of his pants. So that has caused some problems.
He also had an infection at the stoma once because he didn't clean it properly. But overall, the position of the stoma and finding the right skin guard and spray to protect his skin from the bag and the tape has been the hardest part of the surgery.