I feel I need professional help. Who do I turn to ?

I have issues. With my own life and especially my feelings towards my friends. Especially my ex best friend. I cant talk to her bc i emailed her and no response. It's driving men crazy. Its making me depressed as well. Not majorly depressed, but enough to where it's distracting and it's making a big impact on how I feel about the situation. What can I do? Who can I go to? HELP!!!???? Please!