Individual error bars w/ a clustered bar chart??

I'm super new to Excel and I have a lab write-up due tomorrow and have been struggling with this one thing! So I've created a clustered bar chart with three separate categories and two bars within each category! I'm like 85% sure that my data is grouped within two series, the two series of either bar according to what shows when I open "Select Data." I'm looking to add error bars to the six individual bars with Standard Errors that I have calculated and stored in a workbook (I think it's called?) but can't find a way to do that? I've tried doing the "Format Error Bars" --> "Custom" --> "Specify Value" but it always groups the bars within the two series together! Seriously approaching my breaking point any help is much appreciated!!! I'm wondering if I need to completely redo the table my chart is drawing its data from so each bar is of a separate series? But I also need it to look the way it does now, visually-wise, if that makes sense so who knows if that's possible!