Before I started using this servicwebsite, I was not sure why people would be willing to spend time and correcting other people's writing.

Technically nothing wrong with "service," but "website" is more precise.

However, once I got started and the system showed passages ofwritten in my native language for me to correct, I found reading those passages interesting!

Your sentence is fine, but this helps clarify your meaning.

It was like meeting new friends who shared their sharing thoughts that you usually wouldn't hearget to hear with you.

So I hope that the thoughts I will share here will also interest people soand that they will feel like it's worth their time to reading.

Before I started using this service, I was not sure why people would be willing to spend time and correcting other people's writing.

It was like meeting new friends whoand hearing them shared their thoughts that you usunormally wouldn't hear.

I understand what you mean, it's kind of hard to put into words.

So I hope that the thoughts I will share here will also interest people so that they will feelind reading them worth their time reading.