I left school when I was younger due to myearly due to having a mental illness. I left school early due to having a mental illness.

What you wrote is correct but sounds a bit odd

And nNow, I am strugglinge to live my life like anya normal personlife by having a good job. Now, I struggle to live a normal life by having a good job.

Once again your writing is clear but could perhaps flow better

This year, I've read some books about entrepreneurship and started to have some ideas about establishing a businesses. This year, I've read some books about entrepreneurship and started to have some ideas about establishing a business.

I'm going to apply what I've read ton my first business in the hope that it thrives. I'm going to apply what I've read to my first business in the hope that it thrives.

I strongly believe in self-education so much!. I strongly believe in self-education.