Charitable or Cheap?

So I was buying a new hoodie at a sporting goods chain the other day, and as I waited for my receipt, the cashier asked me if I wanted to donate to the American Red Cross. Noticing my indecision, the cashier politely said that donations could be as little as a dollar. After the immediate hesitation, I said that I would donate. And when asked how much, I quickly responded "a dollar."

Normally I wouldn't think twice about donating to a charity. Some pocket change, a dollar, or even more: I tend to give money to organizations when asked or on my own terms. However, this situation was weird for me. It seemed like I was bombarded by the question and really had no choice but to say yes. I was forced, or almost guilted, into donating-- not that that's necessarily a bad thing. It's probably a very good thing for the charities benefiting from such practices.

Then, once I made it clear that I was giving the minimum amount-- a dollar-- I couldn't help but feel like a cheapskate. There I was spending some forty bucks on a new hoodie, yet I couldn't shell out more than a dollar for the Red Cross? What's more is that I didn't even immediately decide to give anything. Was my early indecision just a result of the fact that I felt bombarded by the question?

Why do I feel so weird about this? I mean, I did make a donation. Was I charitable or was I just plain cheap?