Relax, Supercon. Take a deep breath. It's not the end of the world if people don't join your roleplay, reacting harshly to people isn't going to fix it.

I've had a lot of roleplays rejected, and I mean a lot. No interest whatsoever. Shit happens.

One thing you can do is to go back to the drawing board; rewrite your idea, see where it can be improved, and don't stop until you are satisfied with it. Alternatively you can come up with a fresh idea, or join someone else's roleplay.

Also, your alchemy idea was pretty interesting. You just need to work on your presentation more. I get that you want to keep the story a surprise, and that it's heavily character driven, but you still gotta give people more info. Not too much, not too little. Give 'em enough to lure them in. 

And don't lash out at people either, that only discourage others from joining you. It's a roleplaying forum; we're here to have fun, not demean each other. Unless you're both masochist, I guess it's cool then.