I think a lot of us wish we were diagnosed at 23!
I hear you though- I feel like I would have avoided a lot of pain, destruction, and aggravation if I had been diagnosed earlier.
What helped me the most were these forums and reading books about the illness. However- keep in mind that not everyone is the same, and the progression and presentation of bipolar varies. I found that a lot of the books, while informational, were a little depressing. Also, people tend to turn to forums when they are in a bad spot, so sometimes it can seem like having bipolar is the worst thing ever and it's just a constant struggle. That's not the case for everyone. There are plenty of people that are able to find some level of stability. It's not all bad.
Having a good doctor, therapist, and support system do wonders. You are going to be your own best advocate. Do your research and find a med regimine and basic life routine that works for you.
Finally- put a crisis plan in place. Here is a great link:
http://www.namihelps.org/Crisis-Booklet-Adults.pdf

Knowing that I have a plan in place if things start to go wrong makes me feel a lot better. I know who to call, what to do, and if necessary, what hospital I want to go to and what meds I'm willing to take.
Anyway, good luck and welcome to the forum!