NO! Please don't pull out of the BB because some eejit was overly critical. I know my ideas are terrible and I write because I'd probably go mad if I didn't (seriously, it feels like fireworks in my head whenever I get an idea no matter how bad it is - fireworks hurt...) so hey, if you do it then you're going to be better than me. Also, don't panic if your story isn't finished, you can always enter next year and feel smug that it's all done and dusted while the rest of us are running about like headless chickens.
I remember getting one of my first stories attacked, the review started with 'What utter rubbish'. You can probably guess how the rest of it went. I was lucky enough that several other members of the site all reviewed it with positive comments to cheer me up. From my experience (limited as it may be) the Professional's fandom is one of the most welcoming ones I've ever been in and I can solemnly swear that I wouldn't be mean in ANY WAY shape or form. I bet all of the other writers are going to laugh at how bad my story is - you can too if you want. After all, it's my first time so I'm probably going to be rubbish.
Soo... I don't know if I've just rambled on at you or if this is in any way helpful or I've just been annoying, but remember this... failure is ALWAYS an option. *Huge healing hug*.
I hope you stay in. Please don't worry about it.
*Even bigger healing hug*
Agent Talis.