It can be scary to confront people because....

I think it is because people in general are unpredictable and you can only control the way you will react.

You dont know how theyll respond. And even if they are supportive of whatever it is your confronting them about, sometimes its still hard to be vulnerable and put yourself out there.

..they're people

Because you don't know how they will react

the fear of saying the wrong thing and offending someone by mistake (which has happened before)

You never know what they will say, if they understand. Youlol scared theyll never know your situation and be able to help. Its more then just letting someone in but letting your control go.

The fear that they will see our mistakes which makes us super vulnerable

Because you might lose them forever.... or they won't accept their mistakes....

It's scary to confront people for me because I always worry I have misunderstood what they said/did and that I am misreading the situation.

I'm terrified of them screaming at me, hurting me, or punishing me (whether immediately or later, when I'm not expecting it).