I’m a white collared, masters degree holding federal employee and I didn’t get an option NOT to be in a union.

I see you're leading off with pure bullshit. That is a bold strategy, I wonder if it will work for you.

As a federal employee you would have to fill out an application to join the local chapter of a union such as AFGE.

If you didn't apply to join, then you didn't join.

I don’t know if I pay dues

You have a master's degree and you don't know whether or not you're paying for something? You can't interpret your pay stub to see if money is being deducted for union dues or not?

Where exactly did you get your master's degree, Liberty University? The local Walmart? It is clearly not doing you any good.