I'm introvert myself (INTP). I share your frustration. Maybe you have some business hints for introverts? AFAIK, the only successful Unicorn created by INTP's is Google, but I cannot have a talk with Google founders, obviously.
I think it depends very much on your goals. For me, after going through YC with my first company and having a difficult four years chasing scale, I realized that I was oriented more toward lifestyle/reliability/freedom, and I've been fairly focused on that for the last 10 years (although it really only took a couple years to achieve once I was clear on my goals, and has been pretty relaxed since then).
So with that caveat out of the way, my top-of-mind career advice for entrepreneurial introverts is:
1 // Learning how to talk to (and listen to) people is probably the highest-leverage career skill you'll ever learn, even if you only go from "terrible" to "functional." There's a tremendous amount of discomfort while learning it, but that discomfort is temporary. I'll never "like" talking to strangers, and I'll always need to manage my energy levels, context, and recovery time. That being said, the ability to do so when useful to my career (like custdev or sales or fundraising) or life (like making friends in a new city or negotiating with an angry plumber) has been transformational. The pain is temporary and the benefit is profound.
2 // Journal each morning. Braindump your frustrations/goals/fears onto paper. Your brain likely works differently from most "successful" people, which means that the common advice won't fully resonate with you, and you'll need to chart more of your own path. This requires thinking, and for a lot of introverts, writing is the clearest way to think (but if you're different, use what works for you). Similarly, run every piece of advice you hear (well, the compelling bits anyway) through a personality filter, normalize it for personality/context, and then decide whether it's likely to be right you. Common example: "Go to that conference and meet some customers!" Maybe that works for other people, but it has a 0% chance of working for me. But there's a valuable core concept to that advice (go engage with new customers) that can perhaps be adjusted to a context I'm comfortable in.
3 // Cultivate relationships with strong potential cofounders long before you need them. You'll never be as quick on the draw in conversation as others, so you need the important relationships built ahead of time. For potential cofounders (the most important network available), the way to do that is by collaborating on small, time-constrained side projects. Allows both parties to evaluate what each other bring to table outside of an "urgent" situation, and without relying on quick talking.
4 // Don't let anyone press you into "right now" negotiations or decisions. Use live conversations to gather data, and then use your time alone to process it and come to a decision about next steps. Repeat if necessary. Nobody will give you this time by default, but nobody will deny it to you once you ask (and if they do, you probably shouldn't work with them anyway).
There's probably more, that's just top of mind, but it's what feels important to my brain right now.
