Drugs and Alcohol

So recently, I've been kinda down in the dumps.... A few things have happened in the past week that have really put weights on me. And honestly, all I've wanted to do since is smoke weed and get drunk (and I'm only 16), just to forget everything. The first time I got drunk, I'm pretty sure I was 14, and the first time I got high, I was 15.... What should I do?