I am mixed and i have thick hair...I have naturally curly hair but when i straighten it, it is thick on the sides and sticks out. I wanted to know would it be back to get my hair thinned out?

I would not recommend that you thin your hair. If you do, when you wear it curly it will only look bushier, and when you wear it straight, it'll look like you have lots of split ends. Try some kind of styling agent to smooth your edges instead. You'll like the results a lot better.