Perhaps if you "train" yourself with more exposure it might come easier. In fact, I guarantee you that it will become easier and easier with more exposure. Humans adopt in such way. There is nothing intrinsic inside of us that makes us fear large crowds or feeling unfmocortbale. Rather, the modern inclusion in our shitholes we call homes turned us into agoraphobics (more or less).

I have never been the life of the whole party, I am comfortable being the life of a smaller party within the whole party. Being an introvert doesn't define me, but it does in a way describe the situations where I am more comfortable.

You still need others to draw your energy from. This is all it matters, not the amount of people. You are as introvert as everyone else. You just happen to related to less people. Everyone has a limit and it can change depending on the type of job, psychological state, exposure, cultural paradigm and situation.