I was single when I got my ileostomy at age of 20 for crohn's. TBH best decision I ever made, it gave me my life back and as for dating etc made no difference. I met my husband 2 years later and told him on our first proper date, if he was going to run with shock didn't want to get too attached to him, and he wasn't bothered at all. The other boyfriends I had in those two years were not bothered either, so don't worry about that.
However, only you can make the decision, you have to think about how your life is at the moment and whether you want to continue living like that or whether you have got to the point of having enough of the bathroom dash, pain, lack of life etc. Having the bag is just as much a mental decision as well as a physical, to me it has never been a big deal. I can see where you are coming from by saying being single with a bag is not attractive but then again rushing to the bathroom and being in pain aren't all that sexy either so it is really if you can view it as a positive and not a negative. Gaining your life back as opposed to allowing this illness to rule you.
All my friends and colleagues know, not embarrased by it as it allowed me to live my life again. Good luck with whatever you decide, only you will know what is best for you.
Crohn's dx 1989, loop ileo 1992, end ileo 1992. Arthritis developed 1990 Stoma abcess 1995. Azathioprine started 1995. Panprocolorectomy 1999. Stillbirth 2000, antiphospholipid syndrome dx 2000. Flare up 2004, stoma abcess and strictoplasty 2004. Low blood pressure dx with impaired kidney function 2006, fludrocortisone pres. flare up 2010, steroids, Humira, codeine.