Whenever I create a mod and go to the data file on the startup screen for the game, and I check the box for the mod. Only the mods that i create do not work. I follow the wiki instructions and everything, and mods that were created by other users work, its only mine that dont. Any help?

Update your game, that's the #1 cause - that is, an updated CS without an updated game. Mods made with the latest version of the CS will not load in an unpatched game.

I can't, the update wont work... ( I pirated... SHHH!). Is there an unofficial update that can do this?

The construction set is the same version as my game...

Pirated? Thats probably why. I wouldn't go saying that on Bethesdas OFFICIAL site.

Sorry I can't help you any further.

I had purchased the game before but when i got a new computer i couldnt find the security code. so i didnt want to pay another $60. but... all the other mods work. just not the ones i make. i have tons of mods made by other people. its just mine dont show up in the game when i want to use them. I.E. I put a house in anvil and it doesnt show up. I put some items in a crate and the neither the crate nor the item show up. why is it just my mods that will not work in the game?

Brilliant! Come onto the developer's own private forums and admit to pirating the game.