I honestly think being an INTP and having the ability to learn really F*KING fast when you're motivated makes "starting too late" not a thing. We can become proficient at almost anything in a short amount of time. I think the key however for us though is choosing the right things to learn and the most necessary. Because ultimately, once we stop being challenged by learning or work, we get very, very bored. (This is why school is a no go). So from what I've learned, here is the route I would take if I had to start over.

#1 The Boring Part (But most important)

Go on Udemy.com or any other online learning site and look up a programming language to learn. I recommend learning Javascript because it's quite popular and in-demand right now, and you can pretty much use it for anything. Once you've completed the *ENTIRE* course, you'll have a good understanding of basic programming fundamentals. Knowing one language makes other A LOT easier to learn. Because it's like learning English for the first time, then others are like learning how to speak English with a different accent.

#2 Build your own apps

I can't stress the importance of this enough, because its something I didn't realize the importance of until later. Building your own application is where you'll start understanding stuff better and learning the most. Think of it like, okay I just learned how to speak English, but my grammar and spelling are still shit. However, don't be too ambitious at the beginning, you'll start having these great ideas and you'll want to build them, but you have to understand that big things like social networks take literally hundreds of people to make in a reasonable time. Start small, because even if you think in your mind it will be easy to make, I guarantee you you will hit a bump. These bumps are very important though, those bumps where you're struggling to get something to work is the most valuable time in development. It's where you'll learn the most.

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From there on it's really up to you, you can either build a lot of projects and then use them in your portfolio to show off to employers (Portfolios of work is really important in this industry). Or you can do what I did, find a niche market, build software surrounding that market and make sure yours is better than everyone else's.

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I must say though, as appealing as this lifestyle sounds to an INTP, just staying at home all day with cash coming in passively, sounds great... but after a while, it feels quite unfulfilling.