How long have you been here... Since December? That's far too early for you to give up. I've been here since May and I've only had one real serious theory. *shocker*
In any case, just do some research beforehand and think it out completely before you press that little button that says 'Submit' and I'm sure it'll be fine.
And, of course, it doesn't hurt to read the stickies and other threads as well.
Edit: Grrr. You've only been here since December! You haven't been here long enough to start complaining! So suck it up and quit your bitching, Nancy! D< Jk, jk. But it is true. You've only been here a little while and you're throwing in the towel? Now, I can see that if you've been here for a few months and all your theories are crap not that good, but if you've only been here for as long as you have, then all I can say is you're going to need to suck it up and try to get better. Do some research, read the stickies, search and see if there's a thread like it before hand, whatever you have to do, do it. Just don't make a thread like this and sound like a whiny, little baby. D< Cuz, you know, that's a bit annoying.