Paul began preaching as soon as he was certain that that was the will of God for his life.
It is interesting that he also pointed out that he didn’t go to others to gather their opinion on this calling from Christ.
Perhaps it was because he knew that their opinions shouldn’t sway his decision.
I encourage you to go forth with what The Lord has laid on your heart. Don’t look to others for confirmation. Also, don’t look to others hoping for discouragement.
Just trust Jesus’ guiding and boldly go on.