What are the sentences that nobody feels bad about?

As follows:

1. It turns out that all along. I am the only one in my world. No one has ever walked in. No one has stayed.

2. Actually, I'm not that strong. I just learned to pretend like most people.

3. Why is the friendship in the world getting more and more empty, and all that remains is the feelings bought with money?

4. I don't ask, I don't mention, and when I'm sad, I keep walking alone.

5, seemingly heartless, careless girl, just leave all the tenderness to the person who deserves to love.

6. Every single person hides at least one heartbreaking secret.