You're welcome, nice to meet you! So, I'm guessing the frizziness is actually not natural and is a result of the heat straightening over many years. Look at a photo of your hair when your were younger, before you straightened. My frizz was due to damage. I have been doing several things to get back to healthier hair. Here are some:
-stopped trimming my hair for awhile
-using conditioning-only washes and very diluted shampoo (only rarely do I use shampoo). Check out the long hair forum for more info on how to do this.
-not heat straightening anymore
-sleeping in a silk cap at night
-wearing up-dos (buns, braids) to protect my hair (these have the added benefit of smoothing my hair into soft waves and eliminating much of the frizz when I choose to wear it down occasionally)
That's all I can think of for now. The long hair forum is great and has lots of good support and information for healthier hair. I think it is more active than the fine hair forum. Oh, and I guess trying to accept my hair in its natural state is something I've been working on doing as well. See you on the long hair board I hope