Not from any specific person, but the idea that you have to step outside your comfort zone and do X and Y even though it doesn't come naturally to you. Every time I did that things got messed up and I ended up worse than I was before. If you're outside your comfort zone, you will act in non-authentic ways, and when you're not being authentic, you can't be the best possible you. Examples of stepping outside comfort zo…
That being said, your points are valid depending on what you are used to. The social event where you know no one is a natural step after you learn to mingle with strangers alongside friends; if you haven't done that at least, the event will probably suck.