what i have perceived so far is that the environment in which you are brought up matters the most, i've seen cases where confidence given resulted in over-confidence, it depends the way we utilize it & most importantly where we utilize it.
coming back to maturity, its more like a shell to me, which i'll have to break-up myself, no one will hammer it for me, and if i keep following in other's shadows, then i'd be dependant & hence useless on the face of earth. parents / guardians play an important role here as well, unfortunately some parents are not as open-minded as my own mother and won't have their child having anything to do with remotely unrealistic stuff ala PC oriented (unrealistic at pakistan). To those young souls my heart goes out to you. You indeed have a rough journey ahead of you, for I and many others have witnessed the repercussions of going against their wishes, to those I say don't wait for the maturity to come to you, just go for it yourself, remember it's better to fail miserably than keep yourself away from that task. If I were speaking to myself in your case I would have ignored this suggestion, like many of you will. Waiting is not a common virtue in youth. so I shall give you my advice, 'Go get It'