The Samaritans isn't exclusively for people who are feeling depressed or who are suicidal. If you are feeling negative in any way, and you want to talk about those negative feelings with someone who will listen to you, then Samaritans are for you.
Unfortunately, there are not more services like the Samaritans; the whole premise of the service is to open up and talk about your feelings that are causing you to feel emotionally distressed.
Opening up, whether it be anonymously or not, is the best thing for alleviating negative feelings in my opinion (From my own experience also); don't lambast others for opening up. If you don't like what you see, just don't read the thread.