Given my income and my economic situation I shouldn't feel anxious, yet I can't relax thinking every hour spent watching netflix is in a way costing me ~110$.

It doesn't work this way.

Money is a fiction we created, a way to measure debts and legal liabilities. (Barter economies never existed; money emerges very quickly, and is used for this purpose.) Time is real, and it's yours. You deserve time to relax. If you spend every hour optimizing for work productivity, you'll burn yourself out and have "unplanned downtime"... trust me, that's not what you want. Better to work at a reasonable pace--in the long run, no one does more than ~1500 hours per year of meaningful work anyway--and avoid the stochasticity of unplanned downtime.

I work on my hard and soft skills through certifications so I can up even more my hourly rate.

There's nothing wrong with that. You've got to do what's best for you. No one eles will.

It's a never ending race, I've been playing this game since 2016, finding new ways to earn more, not because I'm passionate about it, but because I'm anxious everything could come crashing down in a couple of years and I'll need the money.

I hate saying this, but it could. Disaster can happen to any of us, whether personal in scale (sickness) or global (sickness again, because COVID-19 isn't necessarily over). Everyone is in the same boat, even the very rich (Bezos or Musk could get cancer). The negative outliers are dreadful. An air conditioner could fall on you tomorrow. The probability of each of your atoms quantum tunneling into the far reaches of the universe, although so infinitesimally small it's ridiculous, is technically nonzero.

This is probably an unpopular suggestion, but studying religion (don't feel pushed to pick one; study many) often helps. For my part, I think Buddhism has the most accurate model of mind and impermanence, Judaism has the strongest theology and ethics, and Christianity has a great model in Jesus (even if I don't consider him to be messiah, nor believe he considered himself such) of how to live in the world. The ancients were smarter than we give them credit for.

I feel like we are destroying our planet, destroying our economy, we make poor people poorer, stir political extremes, we alienate the younger generation with social medias, there is war in Europe, everything is about politics when it should be about science and people...

This is all true, but if you're not directly making it worse, then you shouldn't feel bad about it. If you're mining Bitcoin, you have something to feel bad about. If you're building websites for restaurants, you shouldn't feel guilty, because even though you are technically participating in capitalism--an objectively immoral system--you're also helping people (who, like you, need to eat) better their lives.

No one can predict the future. Will capitalism throw humanity off the rails? Or will it be overthrown? (And will such overthrow be a good thing, or will it be replaced by something worse?) No one knows the answers. All you can hold yourself responsible for is living one day at a time.

I've tried not caring, going to bars and restaurants and beautiful places in vacation, getting a new car, finding hobbies... but I can't pretend, I don't know how to cope anymore.

This never helps as much as it should. Hedonic adaptation happens fast. Read more, learn more, and while it's good to stay aware of the world and your role in it, this too can be overdone. You're not killing the planet every time you drive to the grocery store--at least, no more than lightning kills the planet when it starts a forest fire, as it has done for hundreds of millions of years--it's far, far more complicated than that and you can't hold yourself responsible for decisions made by others.