That's not how, in physical reality, the world works. The question is not 'what is needed' but 'what adds value'.
If you walk into a room where a full crew of people are painting the walls, you don't add any value by picking up a paintbrush yourself - you may even get in the way. You need to find something valuable to contribute.
In our real world, many things that are needed are already well provided for: They are so cheap and easy to produce, that making more doesn't add value (and consequently earns little income). Making t-shirts is very cheap and easy; you provide little value by doing it yourself and consequently you won't be paid much for it. Another example is water: Potable water is absolutely essential to life - the most essential thing. But it's already well provided for and therefore we don't invest substantial resources in producing it. We'd be a very poor country if we made t-shirts and potable water, and deservedly so - we'd be adding little value to the world.
We add value to the world by doing hard things that others can't do: Designing chips, designing airplanes, writing software. Science is hard. Those add a lot of value - and you get paid well for it.
We're not starting from a world of nothing - maybe like 10,000 years ago - and adding things to it. Then t-shirts and especially potable water would be essential. We're starting in the world as it is now. Manufacturing, for many products, was valuable and hard in early-to-mid 20th century; when Henry Ford first did it, it was hard and extremely valuable. Now lots of people can do it and we add little value by doing it ourselves, and we won't get paid well either.
If you walk into a room where a full crew of people are painting the walls, you don't add any value by picking up a paintbrush yourself - you may even get in the way. You need to find something valuable to contribute.
In our real world, many things that are needed are already well provided for: They are so cheap and easy to produce, that making more doesn't add value (and consequently earns little income). Making t-shirts is very cheap and easy; you provide little value by doing it yourself and consequently you won't be paid much for it. Another example is water: Potable water is absolutely essential to life - the most essential thing. But it's already well provided for and therefore we don't invest substantial resources in producing it. We'd be a very poor country if we made t-shirts and potable water, and deservedly so - we'd be adding little value to the world.
We add value to the world by doing hard things that others can't do: Designing chips, designing airplanes, writing software. Science is hard. Those add a lot of value - and you get paid well for it.
We're not starting from a world of nothing - maybe like 10,000 years ago - and adding things to it. Then t-shirts and especially potable water would be essential. We're starting in the world as it is now. Manufacturing, for many products, was valuable and hard in early-to-mid 20th century; when Henry Ford first did it, it was hard and extremely valuable. Now lots of people can do it and we add little value by doing it ourselves, and we won't get paid well either.