I promise you this
will be long.
A significiant percentage of girls will undergo this les-like
thingy, especially during teens. You are NOT a
lesbian unless you acknowledge and wants to be one. Even acting
like has nothing to do - (Have a good friend who became a butch for
popularity sake - don't ask me why, girls sch usually have such
politics)
Before you define a lesbian, you must understand how a lesbian is
form. There are many school of thoughts in this case, but mine will
make you fully understand (at least a good insight - but of course,
if you are a christian - you can stop reading totally and probably
seek help from your pastor if things are getting harsh inside you.
My theory would probably conflict with religions ones)
First, you have to believe in the existence of reincarntion. (If
there was a God, no God will create a homosexual man/woman).
Next, you will understand basis science theory. (Like pole repel
and unlike pole attracts)
Third, you have to understand simple maths theory. (Two negative
equal positive. E.g. 1- -1 = 2. Positive + positive is still
positive. E.g. 1+1 = 2 )
***
A soul and a body is different. Soul contains two energies - one
mascline and one feminine. (Gonna skip another theory which will
explain the existance of true love). During reincarnation, the soul
and unite with the body - a life is created. What makes a person's
gender can be explained by scientific means. (What XY, etc). Then
after birth, a biological girl/guy is born.
Throughout countless of reincarnation - you will be re-born from
man and woman or either one of them generally. For a lesbian to
form, you must understand that a soul that is born many times of a
woman will be a feminine soul. During one reincarnation and this
soul is born a man - there will be a free will conscious decision
later in teens stage. (Biological growth pouring in and Higher Twin
Self theory seeking for other half). 
This girl may feel more man than a woman - because biologically she
is a woman, but her soul is inclinced towards the abundance of
mascline energy. Astrology theory of South/North Nodes is
applicable here. (South Nodes: we are familiar with what we are
good at, our past, our achievement. But we receive zero growth
because we have already been-there-done-that. North Nodes: This is
where we must go. We must move to new areas, learn new things. But
this area is dark and bleak. Future is uncertain. But if we never
try, we never know)
In very simple words: This girl's soul, being very mascline, would
want to revert back to its original feel and reject the current
lesson of her being a woman. Psychologically, people are
more comfortable with things that they know and familiar with. This
is same for the soul.
Then all your psychological theory comes in - if your environment,
blar blar blar, influence you, this will affect your decision to
succumb to your soul. You acknowledge them, you became a lesbian
and reject your biological gender. Then, emotional, mental and
spiritual conflicts will hang around for as long as you re-accept
your life lesson again.
What is a lesbian? A girl falling in love with another girl. Maths
theory says two negative makes it positive. That's the reason why
people are more comfortable in seeing lesbians than gays. (Woman
are negative and man are positive).
But I thought falling in love
must be unlike poles?
You are right. Only
unlike poles attracts.
Then how come a girl fall in love
with a girl?
Love is spiritual. The answer is your soul's energy. Mascline and
feminine energy attracts. And since negative and negative =
positive, girls are more prone to such thingy because it seemed
'more ok'. Both can be girls - but one has mascline soul and the
other feminine soul.
****
Thinking of her is nothing. Everything is pure admiring on your
part. You connect with her, but doesn't mean anything. Unless you
wants to be - its all about free will and your decision. Some
people don't have a choice - actually they have, but their
situation is heavily link with their personal karma, it's
difficult. 
Cheers
