Dilemma

I feel overwhelmed during my time as web developer. Many times I thought to resign from this job when I stuck in writing code, but I always feel enjoy when I resolve an error or my code running well as I hope.

I am a slow-learner person, especially for new things. Being a react developer is a new thing in my life because my educational background was not IT. I am having trouble for understanding about the logic, the algorithm, main and basic concepts of javascript, and state management such as redux.

Especially logic. Logic kills my brain slowly (haha) yet at the same time improve my critical thinking and problem solving skills. But I really need more more and more time to learn it. While, in my current job, I have to coding fast. There is a bunch of logic I should learn in short time until to the point that I sacrifice my health (recently I sleep at 4.00 am and have to wake up at 8.00 am), my productivity (I have nothing to do except coding), my family (I spent more time lonely inside my bedroom), and my mental health (feel overwhelmed, stress, overthinking, emotional, etc).

I wanna resign, but I really want to explore more in this field.

For those who read this post, I wanna ask you:
When should I am stop being a developer? When should I am thinking like "Enough for me. This is not my place to growth. I had push my limit." When should I have to switch my career?

So that I know when to stop or continue..

Thank you !