First of all, becoming an entrepreneur isn't for everyone. You need the right skills, environment, and personality. You can also become rich without starting a business or a startup. There are many lessons on the internet about this. You can even become wealthy as a janitor by investing wisely.
Startups are also problematic because people nowadays think this type of organization is the newest and therefore the best. Well, that's wrong! Personally, I don't like startups because this kind of structure violates the #1 rule of business: earning profits.
Chasing user bases and other metrics that aren't profit-focused is usually unsustainable. This means you're only good at presenting your business plan to "suckers" (i.e., venture capitalists or investors).
Therefore, build a small business instead. Earn profits by selling something valuable in your community rather than creating the "perfect" business plan and "scamming" VCs. The path may be difficult at first, but if you grow --even at a much slower pace than startups-- you'll find that you can eventually become wealthy.
Source: Multiple sources internalized and rewritten