First of all, Welcome 
Get started on your blog here ont his site so you can keep track of your treatment.
Here are my thoughts on crossbites. There are millions of people walking around with crossbites that never notice and never have any issues. Just as you have...
However once it is brought to your attention, you want to get it fixed just in case you are one of those people that will have issues later on in your life with chewing, tmj, etc.
I personally wouldn't sweat it and would just move on. But there are ortho's that will push you are to get it fixed.
It really depends on you and if you want to have a so called insurance for later on in life and the perfect bite and smile ...
Braced Twice. Wear Your Retainers!
Ceramic Braces On Top and Metal Braces On Bottom, Palatal Expander - First Time Around
Metal braces top and bottom - Second Time
Now Wearing Retainers At Night!