Ask HN: I'm depressed, what should I do?

I am 30 years old, working in customer service. I don't like that job at all. I always feel tensed and depressed. I always wanted to become a developer. In last 10 years I tried to learn several programming languages such c++, visual basic, c#, php, JavaScript on my own. I failed to learn any of these lanagauges. I know a bit about building websites. I am very much interested in learning any programming language that can help me build good future. I don't know what to do. I am looking for advice.