Jeremiah 12:5 (NKJV)
The phrase, "I can do that myself" is something that children will sometimes say when an adult tries to help them with something that the child thinks they are able to do on their own. But what often happens is that when the child tries to do the thing they were so confident about doing, the child is not really ready to actually do that thing successfully. While children do grow up and take on responsibilities of their own, they first have to learn and develop in how to do those things by themselves.
Spiritual growth and development are something that should be normal for a Christian; if that is not taking place, then something is wrong. But what can happen with natural children can also happen with spiritual children. Sometimes a Christian senses God leading them into some type of ministry work, and that Christian does everything that they can to take a step into doing that thing right away, only to find out that they are not yet at the necessary point of spiritual development actually needed to do that thing.
We all need spiritual growth and development, and what God is giving us to do today will actually prepare us for the tomorrow that He has planned. If we are not faithfully and successfully doing what we have at hand to do today, how will we do the "bigger" things that God has planned for us in the future? Our biggest question should not be about what bright future does God have planned for me, but what opportunities has God given me now that I can be faithful in, because these things will prepare us for our bright future with God.