Artchic, I know what it is like to not trust anybody. Perhaps you were hurt very badly by someone professional or personal in the past. I don't know you, but when I was in my early 20s, that was me. So I'm speculating. But what I really want to get across, is that it sounds like you are going through a really hard time right now. Dating can really suck! You are not the only one who feels this way. A lot of people do. I hope that knowing that can bring you a little solace! There are a lot of creeps out there. It's why I don't really do the online dating thing anymore.
If you don't mind me giving you advice, I would say, stay away from people who make comments that make you feel badly, whether its online, or in real life. Surround yourself with good people. And while I was reading this thread, I saw that someone else said that you're not getting help from a therapist or psychiatrist. If that's true, I would encourage you to find someone to help.

There's nothing wrong with going on psych central either. I myself go on here for support, as a supplement for when I am feeling overwhelmed and stressed. But talking to a therapist, when you are ready, could really help.