What are some bitter things about life that is actually true ?

Some people say online it's okay to feel behind in life and you're still young to fix life but I don't if that's true to believe. Like once you think about life and how messed up things are and now you trying to fix it even though you realized you should've done it a long time ago is feel overwhelmed.

When you begin to face your fears after years or avoidance, it becomes so mentally challenging to face them.