Get the pouch! Most who get it love it! Got mine at 19-adjusted quickly. Ate anything I wanted from the get go. Drank alcohol and generally took terrible care of myself as young people are prone to do 
I almost never went to the bathroom at night and just did double duty when I went to the loo. Had occasional pouchitis that would clear in a week or 2 with antibiotics or enemas. I ran into other issues later, with incontinence following bad surgery on a fistula, so learned other ways to manage. Many years later I now have chronic pouchitis and am taking IBD Meds that weren't around 30 years ago. Despite all that, I still prefer my pouch over ostomy.
I hated the ostomy-body image, leaks, skin breakdown, carrying supplies, etc.
Why not get the pouch built and get an ostomy. If you love the ostomy you don't have to hook up the pouch. If you hook up the pouch and it is problematic (low odds on this-high odds it will be a success and you will love it) you can go back to the bag.
I think some may recommend getting pregnant before hooking up the pouch, but many just proceed to pouch and do pregnancy/fertility stuff after.
Just remember that most of us on on this board because we have "issues" of some kind, so this is a skewed sample. Heck-I have issues and I'd still go for the pouch again and aim to keep it-problems and all-as long as possible.