hi starpuppy...
sometimes when opportunity comes, you have to grab it..
can understand that you are still quite young and i guess this is
your first crush...
some pointers to note..
in sec 2, you started to have a crush on her... your classmates
joked abt you 2 and you 2 pretend to go steady?
was this going steady totally pretended? why is there this need to
pretend? what was her reactions to this pretence?
in sec 3, she never took your hints seriously? how obvious was your
hints? how did she reacted towards you during this period?
in sec 4, what was the reason for not talking anymore? drift
further apart? why did u not get an answer from her after you
dropped ur hints?
she never told u how she feel.. but did u ask her how she
feel?
it is part and parcel of life to experience crush, like and love..
(in this sequence)... crush came when you first start to have
feelings for the opposite sex...
crush... is when you have not had any experience of like/love but
you have strong feelings for someone... you may not have known this
person for long and yet you can have strong feelings for him/her...
it can even be like crush on first sight... this arrival of a
different feelings and emotions can sometimes drive you into
believing that you like someone(or more than just 1 person)...
however these crushes will not last... they can easily fade away or
get replaced by new crushes... they are like passers-by in your
life.. they walk near to you and you experience them walking beside
you.. but they dun stop.. they continued on walking...
like... is when you know you have outgrown the crushes stage and
really get to know someone before you grow the feelings of like...
usually something/some incidents will trigger off this feelings of
like.. it can be something that she did ,something that she said,
can be the days you spent together.. there's something that binds
you 2 together... something that holds you 2 together for a
while... if it does not develop to love, it will fade off sooner or
later... this is like taking a bus-ride.. it is a bus that does not
go straight to your destination.. you have to change another bus to
reach your destination. if you never change to another bus, you
will just miss your destination and you will still alight some
where else.. this means that if you never took the likeness to the
next stage(next bus) which is the bus you are supposed to changed
to, the relationship will go on, but sooner or later it will
fail... cos "like" can only carry you on for a certain distance...
it cannot lead you to the last stop....
love... is the last stage.. this is the stage where you know you no
longer just like the person, but you loved the person and you want
to spend more and more times together.. time seems to be on a
standstill, world no longer evolves around you... only 2 of you
seems to exist in this world of your own... you are prepared and
perhaps even ready for marriage!
but remember that love does not stop after
the marriage!
PS: some may wonder how come i'm writing so much and i'm like
writing out of context of the thread.. but starpuppy shld be able
to understand it.. 
from what i see, i would say you are still at the crush stage.. A
have certain traits that you are attracted to.. but how abt another
gal B(perhaps) wif better traits that comes along later? if A is
easily replacable(regardless to whether A accepted you or not),
this can only be called crushes... but then again, crushes are part
of growing up.. 
search your heart... understand your feelings... crushes will not
last.. will your feelings for A last? if A reject you, will you
still be attracted to A? if you wish to "upgrade" ur crush to like,
lets go on..
1) have you ever really find out how A is like? cos there is no
conclusion that we can make of the personality of A here..
2) when you wished her luck for her MT 2 days ago, was she in a
super stressed stage after studying for her MT? did you ask at the
right time, right place? or is it a wrong time, wrong place?
3) guys have to be thick skin in matters of the heart, esp when u
need to get an answer.. you cant be always dropping hints, then
feel paisei and wait for the gal to reply or make the next move..
this is not a waiting game.. somemore you have already waited 2
yrs... if you want the relationship to bear fruits, better take
some actions..
4) take a review about how the friendship between you 2 have been
like for the past 2 yrs.. isn't there too little activities for a
period of 2 yrs?
5) never look down on yourself... low self-esteem is never
good..
6) dun stress too hard thinking of topics to say.. sometimes the
more you stress, the more nothing pop into your mind...
7) find out if there's any other rivals.. dun assume or think.. be
confirmed...
most importantly, caring and sincerity will do the trick...