God called him (Paul) his instrument to take the gosple to gentiles etc, Acts 9 vs 15-16 does not say apostle...From Gods mouth to Ananias ear...He did not say he will be my apostle, tho he could have if he wanted to..God is not a man that he should lie.
Don't know why you insist on this line of thinking, but tell me which of the apostles God directly called His apostles.