Your first shot at fulfilling your calling might not go as hoped.
It didn't for Moses.
When Moses first felt called to intervene on behalf of his people due to the sufferings they were experiencing, he ended up reacting and killing an Egyptian.
This led Moses to live as a fugitive in the wilderness for 40 years.
But God wasn't finished with Moses.
He still wanted to see His purpose fulfilled through him.
And He used the time in the wilderness to prepare him...
... and ultimately God equipped Moses to deliver His people from their oppressors.
So if God keeps giving you an impulse to serve Him in a particular area, He probably has in mind you do so.
Even if some earlier efforts didn't go so well.