Sony Ericsson Xperia X10 :: Text Signatures

I just bought an xperia white, mostly because i heard it was a decent starter smart phone and because it was the best one my provider offered. i was fooling around with it on lunch and added a signature to my texts and now WHENEVER i text for EVERY single text, my name comes up beside it. i've only found one thread about it on the forums, and there was no solution. I like the versatility and styling of the OS texting, and tbh absolute hate the handcent styling. Not to mention i don't really want to have two competing messaging apps on my phone at once..