I turned 20 but I've stopped aging way before that

I have just celebrated my 20th birthday last Saturday (reluctantly due to persistent effort of denying time has caught me under it's wings) and thank God! nothing happens (discounting my sudden weight gain, at least nothing radical).
I was having periodical depression and fugue (fyi, it's a state of temporary blankness where a person in fugue state go over to places without realizing what he's doing, unable to recall memories of what he has done after the fugue period)for over 3 weeks, with fear hanging heavily over me: I don't want to be an adult. I think I had some sort of Peter Pan syndrome, excluding the merry-making, cheerfulness and pranks of children of Neverland.
The only good thing that I can think of happened to me was having a 3 months break from UIA. This small comfort, too will vanish in less than 1 week. Huu...I have class next week T_T
Talking about passing through life, there's a poem that I feel fit the description of the process of aging.

Roads go ever ever on,
Over rock and under tree,
By caves where never sun has shone,
By streams that never find the sea;

Over snow by winter sown,
And through the merry flowers of June,
Over grass and over stone,
And under mountains in the moon.

Roads go ever ever on
Under cloud and under star,
Yet feet that wandering have gone
Turn at last to home afar.

Eyes that fire and sword have seen
And horror in the halls of stone
Look at last on meadows green
And trees and hills they long have known

This poem, from "The Hobbit" by Tolkien is how Bilbo Baggins describes his journey with Thorin & Co. thieving from Smaug. Though, my interpretation of this lovely poem is deviantly far off. I feel that the first line in the first stanza symbolizes the process of living, a journey from one adventure to another. Lol. I've seen tinders and small fires but I've not quite yet reach the pinnacle of my series of adventure in life; as far as I'm concerned, the dragon that needs slaying in my life is not yet here at the moment: no huge crisis that threatens me to the extent of perishable condition for the time being.

Until the dragon that needs slaying come, I shall prepare myself as extensively as I can with gathered wits and conventional wisdom on problem solving methods.