Hi.. im also 17 you have all touched on very good subjects and i agree your inner game is key to a greater confidence however i must point out that gamming a 17 yr old girl is very diffrent to a 24 yr old
Im still quite a newbie to PU but i have noticed that a 17 yr olds social life consists of a large social circle in witch this circle has the same "style" not necessarily the way they dress etc but more how they talk and how they relate, and they all have the same general aspect in witch they view social situations.
These people all go to the same parties share hang out locations etc and there are usualy the more attractive "popular kids" and generally there are boatloads of girls in these groups and it is rare for them to accept random guys and are more likely to be at ease with some one who shares the same "style" as them.
Im not going to go into great detail but i sugest studying the group at witch you wish to game but pay more attention to the guys and see how they act in situations with girls and become more like them not necessarily for the entire time but purely to meet the girls you are intrested in and Nclose (Number close) from there on you can ask them on dates etc
Studying the group may be hard try and get in with the guys if possible
and who knows you might make friends along the way
Goodluck happy gamming!