Why do I keep getting shot? Why can’t someone else get shot?

Because it wouldn't work. Think about it.
Vila would go on about it and wouldn't let us forget it.
Cally has too much sense not to duck and is a smaller target.
You'd feel guilty if it was Avon 'cos he can't use a gun to defend himself yet.
And nobody would be able to live with you if Reya was hurt.

So you drew the short straw.