Not only Sid didn't come from any of those backgrounds, neither did the founder of Freshworks who literally started his company based on reading a hacker news comment. [0]
> But you don’t hit 100% if you try. That’s where the luck part comes into play.
Nope. Sid just knows how to make money and that's him being more than 'lucky' with his experience and marketing GitLab right here which you could have done that as well.
So I only see more excuses here.
[0] https://news.ycombinator.com/item?id=28336815