There isn’t really much else I can add to this: http://www.nydailynews.com/life-style/health/woman-posts-bikini-pic-exposing-colostomy-bags-article-1.1852000
All I can say is that people are beautiful. People are normal. People should not be ashamed if some part of their body is not the same as the majority of others.
I personally never knew what these colostomy bags looked like, and now that I do, I would never think less of a person (woman OR man) who chose to just enjoy themselves in public and not worry about what other people think. Colostomy bag? No big deal. Insulin pump? No big deal. Scars or stretch marks? SO not a big deal.
Enjoy your life and don’t worry about what others think. If they’re uncomfortable, then that is their problem!