well well... should i step in and say my 2?
okay...
well first off, you dont have to so much as earn your respect from other people... the way I see it is that I am goin to take you as one of the best people in the world, until you screw up. If you are just there, and do nothing wrong, I am goin to respect you from the beginning, and if you still do nothing wrong, and actually build on that, then you will earn looaaads of respect, and eventually maturity...
two, at fifteen, everyone seems mature, trust me I have been there and done that, and believe it or not, I had to learn that in a split second, not over time like most people, cause if you didnt know, I am a Marine, so i had to grow up really quick, and even quicker yet becuase I am now an NCO of marines, and I am not even 21 yet... So just swallow, and swallow hard, cause trust me, and take this as a first lesson learned, and know that there are sooo many more coming to ya!!
have a nice life!! we all do!