I'm in a similar situation....I'm a couple of years older, 33, still no kids and my only problem is that I'm obese....my suggestion is think about life afterwards...not the first couple of weeks (we know those will be rough) but think about being healthier, active....enjoying life....
My family is still asking me if I'm sure this is what I want to do, and I tell them, the alternative is living a short life, I rather live, thank you....
When I was your age I decided to have the lapband, because I was scared of the whole rerouting thing with RNY...now 7 years later, if taking 80% of my stomach is what must be done to help me, so be it....
Just remember the reasons why you made the decision for WLS, if you haven't write it down....so you can remind yourself of the positive...