I Don't Like Talking On the Phone

While it's not a problem for you, who cares!

Neither, do I. Unless I know the person who is phoning me and I think it twice.
Anyway, if it's something that you are worried about, I will tell you that it's only a matter of practise. The more you do it, the better. Like any other thing in life.

If it's an important call I answer but if I don't know the number I just let it ring

Yep