As I see it, the problem is in your mindset, more precisely that you're not evolving yourself. At some point, you just created a set of rules that hold you back in life. And you brain is constantly see the world through that particular set of rules: for example, CSS3 is boring, working in Tesla is awesome or I want to change the world, but don't have resources, therefore it's boring or the thing that if you are comparing "boring React" with "cool Autopilot in Tesla" shows the lack of understanding of the world.

Read Carol Dweck about growth mindset, change the mindset and start seeing the world differently.

And also, don't piddle "entrepreneur" and "startup" - I can argue that you really don't know how it works and you just have knowledge of it from cool articles, Tony-Stark-style business moves, and movies. Learn how it really works.