Haha, hello, Fuzzy Moo Moo. Again.
I use a site called Fictionpress.com. You post your work, there are different genres, and you'll get reviews. You shouldn't necessarily depend on the amount of reviews you get, or sometimes what they say; a lot of times, you will get people who say nothing but "Great job, update soon!" My second suggestion is to find a beta reader on Fictionpress. It's kind of a new addition to FP. I'm a beta reader, myself, on FP. You don't *have* to contact me specifically if you don't want to (I'm Olivine), because it depends on what genre you write and what exactly you're looking for- you can find that in the Beta Profiles, what the beta readers are all about. (In case you didn't know, and before I lose you completely, a beta reader is essencially a proof reader/ editor.) And I don't know if you're touchy about it, but you don't have to give out your email to do this beta reading thing. You can do it through FP.
Since you're having troubles with your work and how you feel about it, I think this would be good for you. And as for the throwing things out... just don't delete them. Or throw them in the garbage, whichever. I know you can get frustrated, believe me I'm constantly there, and to the point where you just want to throw the things out, set fire to them if possible and otherwise destroy the evidence of your "terrible" writing. Ha. I know. But really, saving it would do you good. Like I said.
And as for the "OMG best idea ever," that's is my MAIN problem. And that's where I get frustrated, and impatient and feel like "yeah, I'm never going to do this, why am I wasting my time?" Well, I've recently devised a little plan type of thing. I bought a notebook that looks really cool from B&N and in it, I write down anything that comes to mind. I don't force it. Anything that inspires or intrigues me, for instance the movie The Illusionist got me thinking about magicians and magic as more of a casual thing, in the video game Final Fantasy XII, there was a breakout from this one place and the main character meets up with this girl whom I believe him to be in love with or something, that inspired a "break out of captivity" scene. Absolutely anything that gives you an idea. Of course, this also takes patience and I know you're pretty impatient and get frustrated easily. This is actually a better thing to do when you *don't* have a lot of time to write, like now when there are finals and stuff for school because then you're over thinking a little less, which might be good for you, haha. Anyways, these little snippets I write are only about a half a page to a page and a half. I don't force it. And then later, I could combine some scenes or think about them more and/or the characters. I've kind of decided to go with the flow, again using S. Meyer as an example (it is quite fantastic how I always bring her up, huh?).
Anyways. So, there are a ton of things you can do. I'm guessing you'll like the beta reader idea more than the one involving patience, hehe. But either way, I hope you look into them both and see what happens.
PS. You *do* have to sign up on FP to do the beta reader thing. Just before I forgot, I thought you should know.