The one thing I have learned on my journey through 6-7 startups is never start something without a sales person onboard. When we do we end up building something interesting with no customers. I am sure you can be your own sales person, but I don’t have it in me to do both.
I did hundreds of cold calls for someone else. Honestly the most intimidating thing I've done but ended up learning to enjoy it.
I also enjoyed meeting our customers at our conference at previous job and it was a fun experience talking to people and showing off what we'd been working on or understanding what we could improve.
I am not an extroverted person, so it definitely does not come naturally to me - I'm suppressing butterflies if I'm being completely honest.