Last weekend, I was at my parent's home and my aunt, uncle and a family friend were also invited.

I have some anxiety issue which means that, when there is too many people, or just people that I'm not used living with, I can get very anxious. Usually people don't notice (because I hide it), however, this time, my aunt did notice that something was off with me.

She asked me if there was something wrong, I tried to shrug it off but she insisted so I told her that I was experiencing anxiety. When she asked me *why* I was anxious, I didn't know what to respond because I didn't want to hurt her feelings by saying "it's because you are here".

Instead, I said nothing and when my dad suggested that I might not know why, I acted like this was true.

The thing is that I hate lying and I'm not really satisfied with the fact that I had to do that.

What I'm wondering is:
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How could I have tactfully explained to my aunt that the presence of guests always makes me anxious and thus, that my anxiety was due to her presence?

My aunt is very sensitive with low self-confidence, so the more tactful the solution is, the better.

Notes and clarifications
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* The discussion take place at the lunch table when everyone was listening.
* My aunt particularly makes me anxious, but I believe that I would have still been anxious if she weren't there but the two other guests were.
* I have considered just saying "I'm anxious when there is a lot of people around" but I believe it would have been weird since we were only 7 (including me).