HELP! I don't know what to do with my curly/straight/wavy hair anymore!

I don't know what category my hair would fall under now.  My hair is naturally curly but I've always hated it because my big round cheeks seem to look bigger when I leave it natural than when I straighten it.  So as any dumb typical teenager hating her natural look I started straightening my hair out with a flat iron on a daily basis.  The results 10 years later?  Dry hair, less hair, and now when I want to leave curls if I'm too lazy or busy to straighten it, they won't stay!  Some parts are curly, some are straight, some are wavy.  I have to mousse it up and put all these other products in my hair, blow dry, and still end up having to use a 1" curling iron for the hair that won't curl up anymore. I want my curls back!  Summer's coming soon and I don't like adding more heat to my hair on hot days because it dries out even more. I wish I never started straightening my hair to begin with so I now I'm stuck with ugly frizzy, damaged curly/straight/wavy hair and I really don't know how to deal with it anymore.  Any suggestions? Tips? HELP!