My two cents: I'll be turning thirty this year, and empathize with everyone posting on this thread. I have a few talents that God blessed me with, and have received many questions throughout my life as to why I've never pursued them. If I desired, I know I could be doing a few things at this point in my existence that the world would likely praise( musician,writer,actor,fitness model) and these are things that I sometimes have pondered whether it was what I should be shooting for. I was reconsecrated to God through Christ about a year 1/2 ago, but it's only been in the last couple of months that I've received clarity in my spirit as to what I should be doing.
The Word states that it is only through doing the Works of Christ and the Will of the Father that we can find true purpose and meaning in this existence. Jesus didn't say "oh yeah dude, just do your thing, pray to me and my old man once in a while, try and not be a jerk and it'll all work out". He sacrificed everything in order to bestow upon us a sacred mandate of Action through Love. We were created as humans, and even more so when we become saved, to worship God and do the works that his son performed on Earth.
This requires sacrifice on our part, and those sacrifices may have things in common, but are unique for every one of God's sons and daughters that take up the mantle and responsibility granted to us by Christ. In my spirit I have heard this truth, that I must continually sacrifice the things of this world in my life that have no purpose as I press into the Presence of God and Jesus, that the Holy Spirit will grant me Dunamis( Power) to bring Heaven unto Earth.
This is what I believe my and every Chosen of God's true purpose is: to Glorify God by emulating Jesus. To go into the Darkness and bring Light. To heal the oppressed in body,mind, and spirit. To rend demonic forces asunder and cast them into the dry Void that has been made just for their rebellious and wicked selves. And most of all, to bring the Love of our righteous God into this world; there are many powers of Good in this world, but the greatest is Love
I believe that feeling of uncertainty and even emptiness we have felt over "what should I do/where should I go/what am I doing with my life?" is all the evidence there is that our spirits are crying out for the fulfillment that only Holy service and action can provide.
I'll close with a prayer:
Holy Father, I believe we (myself and those in this thread) are here to acknowledge that You are the only thing that can grant us true purpose. I accept there is nothing I can do by my own actions in my existence that can please you, so I ask that you open the eyes and ears of our Hearts, continually, that we may be driven by a restless urge to know you and your Son more and more, that we may become true Ministers and Soldiers in your Army of Light. I pray this in the name of our Brother/Friend/Lord/Master/Saviour Jesus Christ. Amen