With age becomes the meaning of self?

Some say that when you reach a certain age in your twenties you begin to get over the angst and complete self-infatuation you had as a teenager and begin to adopt an introspective viewpoint of yourself. You begin to understand that you're not the centre of the universe, your flaws are not unique to you and nor are your strengths. You are in fact a statistic. You also start to think that, yes, you are at a point that you have to choose which direction you are going to travel in. Some psychologists describe development as a ball rolling down a hill; it can follow a channel, and every now and again it will change direction and choose between an intersection which determines which line you will ultimately end up in. Life is nothing but a continuous rolling of never-ending choices, and it's up to you which one you choose.  And here I am, supposedly sat in that age of knowing where I'm going but instead sat on the verge of uncertainty.

I mean look at the educational system.  From the age of about 3 or 4 you're in a compulsory structure of education.  By 16 it's your choice (or was until the interfering government) whether to continue education or to withdraw and go straight into working.  I saw only one channel for me; to got to sixth form, to go to university, to come out of it with a qualification that will put me in good stead.  But like so many, I failed to plan forward which is why I'm in the predicament of spending a gap year before going back for more education.  But I still don't know if teaching is the right profession for me.  I just do not know.  I am barreling along in life with no set plan, but instead some sort of rudimentary rough draft of what I'm going to do until I decide.

So I sighed when I reached 22 on Friday.  I feel content within myself and have mature to the point that I could be independent if needed.  Yet I still lack introspect on the career side.  When one birthday message asked me if I'd gained the introspect and wisdom that the twenties promise people I was left wondering what to reply.  After taking a day out for recuperation (it seems what my 22year old body, can do, if lack of introspection, is not do what I could do in student life and party all night!) I replied with this:-

I feel so old that I've taken a liken to staying in on a night and watching documentaries. I was even musing today that I'd quite like to be a lawyer! It appears that being this old still hasn't made me content with where I am/any closer to knowing where I want to be in life. 

But I'll still be in ____ next year doing a PGCE and wasting my life until I do know exactly what I want to be! So maybe if you ask that question in a year I can give you a better answer.

And that's exactly all I can provide.  That I have matured.  That I am suddenly aware of all the options out there that I'd never considered.  That I'm following some sort of road and I don't know where it's going.  And I'm fine with that kind of life, only if you watch enough horror movies as I do, you'll know that actually travelling along a road you don't know can lead to disastrous consequences...

So I'm guessing this time next year when I get asked whether I have wisdom and have deep introspection of life I'll be able to give them a clear answer.  But as of yet I can't, and maybe we're never meant to be able to.