This is true. However, it's also true that your attitude towards things is complex and not fully in your control. Hence PTSD, trauma, phobias, etc. It does mean

This is true. However, it's also true that your attitude towards things is complex and not fully in your control. Hence PTSD, trauma, phobias, etc. It does mean, though, that by trying to modify your attitude over time, you can become happier.