No you aren't the only one. I'm on medications like an SSRI that raises prolactin levels. The last time I've checked with my doctor they've said my prolactin levels were normal and I would still lactate. I've been having this problem and it's quite embarrassing actually. I walked into the Target one day and didn't realize it was leaking through my bra and my green cardigan. And I suffered from mastitis or a blocked milk duct years ago. It was really painful. It's common, it's actually called a "lactation disorder".

not me but it does happen to my wife! a co worker of hers was pregnant and she experienced this, not to the same degree as you but it did seem to happen!