He may be asking you that exact question right now.
Reference: v.8 Then I heard the voice of the Lord saying, “Whom shall I send? And who will go for us?” And I said, “Here am I. Send me!” (TNIV Bible)
Explore: I remember standing in a chapel service at Bible college one day feeling quite overwhelmed by my ministry. Not only was I working in a local church, but I was working in the local primary school as their chaplain.