Sales & Use Tax question...?

I bought an entire inventory of items to resell, but had to pay sales & use tax because the vendor would not take the exemption form. I have a few questions. Where do I put the amount that I spent on taxes for my inventory on the Texas Sales & Use Tax Return? Will that be reimbursed? Is the only way to get my Sales & Use Tax back to sell my items to Texas only? Would this be considered tax paid in error on my own purchases? Your help is much appreciated!