Surely they wouldn't tie your tubes so young? I know of many stories of women in their 20's who have wanted it done and had a lot of trouble because they were so young- it seems under 30 is a magical no-go-zone for tube tying?
Op I had a VBAC nearly 3 months ago. I suppose I was oh my in that my ob was a great supporter of this. However the way the antenatal care works in this town is that you get whomever is on call when you go into labour, so I ended up with a dr from a different practice.
I won't go into all the details, but I had a very difficult birth with the typical cascade of intervention that started when 10 hours into labour I finally consented to having my waters broken. I was about 2 minutes away from an emergency c/s when dd was born. I was already on the operating table and had been given enough anaesthesia for a c/s. You can always find the birth story and have a read if you want to know what else happened. Yes, I ended up with the VBAC, but at what cost? The recovery was just as long as the c/s, and I don't think my body will actually ever heal properly- things are still not ok "down there". It has definitely had a negative impact on me in ways I never thought possible.
Sorry to be a Debbie downer, just wanted to point out that sometimes VBAC's can actually be a worse choice than a c/s... But until it actually happens you have no way of knowing which way it will go. All you can do is research properly and make the choice of perhaps not which one you would rather, but which one you definitely wouldn't.