My Education

When I was a teenager I studied at a public high school. Many people think that private schools are better than public schools. I think they are almost always right. It's because some public schools are crowded and they don't have enough physical resources to support the students. It's too bad because education is the key to change the world to for the better. But not all public schools are mean inferior. Yes, I was lucky to have studied in a good school. I say this because I had brilliant teachers who gave me more than knowledge, they taught me how to think. After finishing high school, I went to a public university where I got my degree in engineering. And now, I'm still studying because I strongly believe in continuing education.

Excellent work. I am not sure what you intended by the word "mean."  I think you meant "inferior," "inadequate," "insufficient," or some other equivalent word.