Bless your heart! Please don't beat yourself up for something that happened when you were young and naive. You thought this man loved you. He was a ROTTEN man who took advantage of you, and is probably doing the same thing to MANY OTHER young girls!!! I'm sure you're not the first one he's done this to, and you won't be the last!
People like him roam the internet, looking for young girls that they can "use" and prey on. They enjoy getting them to take pictures of themselves and sending them to him! He's just a nasty beast who belongs in JAIL. He's a child abuser, because you were a minor at the time!!!
So do NOT blame yourself. You were too young to understand what he was doing. It's NOT your fault, honey. Please talk to your counselor at school, or a therapist. Your doctor an refer you to a good therapist who can help you thru this depression. Depression is an ILLNESS and it needs treatment.
Please see your doctor, okay? And let us know how you're doing -- we CARE about you, honey. God bless and please take care of YOU. Hugs, Lee