Naturally Curly and Thin? Hair Tips?

I have naturally curly hair and it is thin. I have straightened it every night and every day for the past 3 months. My grandma loves my curly hair but when I get out of the shower and let it towel dry it is very puffy, and fuzzy. Basically unmanageable. How can I have my naturally curly hair. I'm tired of straightening it. Thanks(: